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<!DOCTYPE html>
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<title>OGC GeoTIFF Standard</title>
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<body class="book">
<div id="header">
<h1>OGC GeoTIFF standard</h1>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div style="page-break-after: always;"></div>
<table class="tableblock frame-none grid-none stretch">
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<td class="tableblock halign-right valign-top" style="background-color: #FFFFFF;"><p class="tableblock"><strong class="big">Open Geospatial Consortium</strong></p></td>
</tr>
<tr>
<td class="tableblock halign-right valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Submission Date: <2019-03-18></p></td>
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<td class="tableblock halign-right valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Approval Date: <yyyy-mm-dd></p></td>
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<td class="tableblock halign-right valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Publication Date: <2019-mm-dd></p></td>
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<td class="tableblock halign-right valign-top" style="background-color: #FFFFFF;"><p class="tableblock">External identifier of this OGC® document: <a href="http://www.opengis.net/doc/{doc-type}/{standard}/{m.n}" class="bare">http://www.opengis.net/doc/{doc-type}/{standard}/{m.n}</a></p></td>
</tr>
<tr>
<td class="tableblock halign-right valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Internal reference number of this OGC® document: 19-008</p></td>
</tr>
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<td class="tableblock halign-right valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Version: 0.4</p></td>
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<tr>
<td class="tableblock halign-right valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Category: OGC® <Implementation></p></td>
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<tr>
<td class="tableblock halign-right valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Editors: Emmanuel Devys, Ted Habermann, Chuck Heazel, Roger Lott, Even Rouault</p></td>
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<table class="tableblock frame-none grid-all stretch">
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<td class="tableblock halign-center valign-top" style="background-color: #FFFFFF;"><p class="tableblock"><strong class="big">OGC GeoTIFF Standard</strong></p></td>
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</tbody>
</table>
<table class="tableblock frame-none grid-none stretch">
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<col style="width: 100%;">
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<td class="tableblock halign-center valign-top" style="background-color: #FFFFFF;"><p class="tableblock"><strong>Copyright notice</strong></p></td>
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<td class="tableblock halign-center valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Copyright © 2019 Open Geospatial Consortium</p></td>
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<td class="tableblock halign-center valign-top" style="background-color: #FFFFFF;"><p class="tableblock">To obtain additional rights of use, visit <a href="http://www.opengeospatial.org/legal/" class="bare">http://www.opengeospatial.org/legal/</a></p></td>
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<td class="tableblock halign-center valign-top" style="background-color: #FFFFFF;"><p class="tableblock"><strong>Warning</strong></p></td>
</tr>
</tbody>
</table>
<div class="paragraph">
<p>This document is not an OGC Standard. This document is distributed for review and comment. This document is subject to change without notice and may not be referred to as an OGC Standard.</p>
</div>
<div class="paragraph">
<p>Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to provide supporting documentation.</p>
</div>
<table class="tableblock frame-all grid-none" style="width: 50%;">
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<col style="width: 100%;">
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<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Document type: OGC® Standard</p></td>
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<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Document subtype: Not Applicable</p></td>
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<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Document stage: Draft</p></td>
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<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Document language: English</p></td>
</tr>
</tbody>
</table>
<div style="page-break-after: always;"></div>
<div class="paragraph">
<p> License Agreement</p>
</div>
<div class="paragraph">
<p><span class="small">Permission is hereby granted by the Open Geospatial Consortium, ("Licensor"), free of charge and subject to the terms set forth below, to any person obtaining a copy of this Intellectual Property and any associated documentation, to deal in the Intellectual Property without restriction (except as set forth below), including without limitation the rights to implement, use, copy, modify, merge, publish, distribute, and/or sublicense copies of the Intellectual Property, and to permit persons to whom the Intellectual Property is furnished to do so, provided that all copyright notices on the intellectual property are retained intact and that each person to whom the Intellectual Property is furnished agrees to the terms of this Agreement.</span></p>
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<p><span class="small">THIS LICENSE IS A COPYRIGHT LICENSE ONLY, AND DOES NOT CONVEY ANY RIGHTS UNDER ANY PATENTS THAT MAY BE IN FORCE ANYWHERE IN THE WORLD.</span></p>
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<p><span class="small">Except as contained in this notice, the name of LICENSOR or of any other holder of a copyright in all or part of the Intellectual Property shall not be used in advertising or otherwise to promote the sale, use or other dealings in this Intellectual Property without prior written authorization of LICENSOR or such copyright holder. LICENSOR is and shall at all times be the sole entity that may authorize you or any third party to use certification marks, trademarks or other special designations to indicate compliance with any LICENSOR standards or specifications. This Agreement is governed by the laws of the Commonwealth of Massachusetts. The application to this Agreement of the United Nations Convention on Contracts for the International Sale of Goods is hereby expressly excluded. In the event any provision of this Agreement shall be deemed unenforceable, void or invalid, such provision shall be modified so as to make it valid and enforceable, and as so modified the entire Agreement shall remain in full force and effect. No decision, action or inaction by LICENSOR shall be construed to be a waiver of any rights or remedies available to it.</span></p>
</div>
<div style="page-break-after: always;"></div>
<div id="toc" class="toc">
<div id="toctitle" class="title">Table of Contents</div>
<ul class="sectlevel1">
<li><a href="#_scope">1. Scope</a></li>
<li><a href="#_conformance">2. Conformance</a></li>
<li><a href="#_references">3. References</a></li>
<li><a href="#_terms_and_definitions">4. Terms and Definitions</a>
<ul class="sectlevel2">
<li><a href="#_band">4.1. band</a></li>
<li><a href="#_cell">4.2. cell</a></li>
<li><a href="#_code">4.3. code</a></li>
<li><a href="#_coordinate">4.4. coordinate</a></li>
<li><a href="#_coordinate_reference_system">4.5. coordinate reference system</a></li>
<li><a href="#_coordinate_system">4.6. coordinate system</a></li>
<li><a href="#_correspondence_model">4.7. correspondence model</a></li>
<li><a href="#_datum">4.8. datum</a></li>
<li><a href="#_device_space">4.9. device space</a></li>
<li><a href="#_double">4.10. double</a></li>
<li><a href="#_ellipsoid">4.11. ellipsoid</a></li>
<li><a href="#_flattening">4.12. flattening</a></li>
<li><a href="#_geocoding">4.13. geocoding</a></li>
<li><a href="#_geographic_coordinate_reference_system">4.14. geographic coordinate reference system</a></li>
<li><a href="#_geokey">4.15. geokey</a></li>
<li><a href="#_georectified">4.16. georectified</a></li>
<li><a href="#_georeferencing">4.17. georeferencing</a></li>
<li><a href="#_geotiff">4.18. GeoTIFF</a></li>
<li><a href="#_grid">4.19. grid</a></li>
<li><a href="#_imagery">4.20. imagery</a></li>
<li><a href="#_meridian">4.21. meridian</a></li>
<li><a href="#_metadata">4.22. metadata</a></li>
<li><a href="#_model_space">4.23. model space</a></li>
<li><a href="#_mosaic">4.24. mosaic</a></li>
<li><a href="#_orthoimage">4.25. orthoimage</a></li>
<li><a href="#_orthorectified_grid">4.26. orthorectified grid</a></li>
<li><a href="#_parallel">4.27. parallel</a></li>
<li><a href="#_pixel">4.28. pixel</a></li>
<li><a href="#_prime_meridian">4.29. prime meridian</a></li>
<li><a href="#_projected_coordinate_reference_system">4.30. projected coordinate reference system</a></li>
<li><a href="#_projection">4.31. projection</a></li>
<li><a href="#_raster">4.32. raster</a></li>
<li><a href="#_rational">4.33. rational</a></li>
<li><a href="#_rectified_grid">4.34. rectified grid</a></li>
<li><a href="#_referenceable_grid">4.35. referenceable grid</a></li>
<li><a href="#_short">4.36. short</a></li>
<li><a href="#_tag">4.37. tag</a></li>
<li><a href="#_vertical_coordinate_reference_system">4.38. vertical coordinate reference system</a></li>
</ul>
</li>
<li><a href="#_abbreviations">5. Abbreviations</a></li>
<li><a href="#_clauses_not_containing_normative_material">6. Clauses not Containing Normative Material</a></li>
<li><a href="#_requirements">7. Requirements</a>
<ul class="sectlevel2">
<li><a href="#_underlying_tiff_requirements">7.1. Underlying TIFF Requirements</a>
<ul class="sectlevel3">
<li><a href="#_requirements_class_tiff">7.1.1. Requirements Class TIFF</a></li>
<li><a href="#_requirements_class_geokeydirectorytag">7.1.2. Requirements Class GeoKeyDirectoryTag</a></li>
<li><a href="#_requirements_class_geokeycode">7.1.3. Requirements Class GeoKeyCode</a></li>
<li><a href="#_requirements_class_geoshortparamstag">7.1.4. Requirements Class GeoShortParamsTag</a></li>
<li><a href="#_requirements_class_geodoubleparamstag">7.1.5. Requirements Class GeoDoubleParamsTag</a></li>
<li><a href="#_requirements_class_geoasciiparamstag">7.1.6. Requirements Class GeoAsciiParamsTag</a></li>
</ul>
</li>
<li><a href="#_geotiff_configuration_geokeys">7.2. GeoTIFF Configuration GeoKeys</a>
<ul class="sectlevel3">
<li><a href="#_requirements_class_gtrastertypegeokey">7.2.1. Requirements Class GTRasterTypeGeoKey</a></li>
<li><a href="#_requirements_class_gtmodeltypegeokey">7.2.2. Requirements Class GTModelTypeGeoKey</a></li>
</ul>
</li>
<li><a href="#_raster_to_model_coordinate_transformation_requirements">7.3. Raster to Model Coordinate Transformation Requirements</a>
<ul class="sectlevel3">
<li><a href="#_requirements_class_modeltiepointtag">7.3.1. Requirements Class ModelTiepointTag</a></li>
<li><a href="#_requirements_class_modelpixelscaletag">7.3.2. Requirements Class ModelPixelScaleTag</a></li>
<li><a href="#_requirements_class_modeltransformationtag">7.3.3. Requirements Class ModelTransformationTag</a></li>
</ul>
</li>
<li><a href="#_requirements_for_definition_when_model_crs_is_from_geotiff_crs_register">7.4. Requirements for definition (when Model CRS is from GeoTIFF CRS register)</a>
<ul class="sectlevel3">
<li><a href="#_overview">7.4.1. Overview</a></li>
<li><a href="#_requirements_class_projectedcrsgeokey">7.4.2. Requirements Class ProjectedCRSGeoKey</a></li>
<li><a href="#_requirements_class_geodeticcrsgeokey">7.4.3. Requirements Class GeodeticCRSGeoKey</a></li>
<li><a href="#_requirements_class_verticalgeokey">7.4.4. Requirements Class VerticalGeoKey</a></li>
<li><a href="#_requirements_class_citation_geokeys">7.4.5. Requirements Class Citation GeoKeys</a></li>
</ul>
</li>
<li><a href="#_requirements_for_definition_of_user_defined_model_crs">7.5. Requirements for definition of user-defined Model CRS</a>
<ul class="sectlevel3">
<li><a href="#_requirements_class_units_geokeys">7.5.1. Requirements Class Units GeoKeys</a></li>
<li><a href="#_requirements_class_unit_size_geokeys">7.5.2. Requirements Class Unit Size GeoKeys</a></li>
<li><a href="#_geodetic_datum">7.5.3. Geodetic Datum</a></li>
<li><a href="#_requirements_class_vertical_datum">7.5.4. Requirements Class Vertical Datum</a></li>
<li><a href="#_map_projection_geokeys">7.5.5. Map Projection GeoKeys</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="#_media_types_for_geotiff_data_encoding">8. Media Types for GeoTIFF data encoding</a></li>
<li><a href="#_abstract_test_suite_normative">Annex A: Abstract Test Suite (Normative)</a>
<ul class="sectlevel2">
<li><a href="#_general_approach">A.1. General Approach</a></li>
<li><a href="#_conformance_class_tiff">A.2. Conformance Class TIFF</a>
<ul class="sectlevel3">
<li><a href="#_tiff_core_test">A.2.1. TIFF Core Test</a></li>
<li><a href="#_tiff_tags_test">A.2.2. TIFF Tags Test</a></li>
<li><a href="#_geokey_directory_test">A.2.3. GeoKey Directory Test</a></li>
<li><a href="#_short_parameters_test">A.2.4. Short Parameters Test</a></li>
<li><a href="#_double_parameters_test">A.2.5. Double Parameters Test</a></li>
<li><a href="#_ascii_parameters_test">A.2.6. ASCII Parameters Test</a></li>
</ul>
</li>
<li><a href="#_conformance_class_raster2model_coordinatetransformation_geokey">A.3. Conformance Class Raster2Model_CoordinateTransformation_GeoKey</a>
<ul class="sectlevel3">
<li><a href="#_modelpixelscaletag_test">A.3.1. ModelPixelScaleTag Test</a></li>
<li><a href="#_modeltiepointtag_test">A.3.2. ModelTiepointTag Test</a></li>
<li><a href="#_modeltransformationtag_test">A.3.3. ModelTransformationTag Test</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="#_geotiff_file_structure_and_geotiff_crs_and_models_principles_informative">Annex B: GeoTIFF File Structure and GeoTIFF CRS and models principles (Informative)</a>
<ul class="sectlevel2">
<li><a href="#_the_geotiff_file_structure">B.1. The GeoTIFF File Structure</a>
<ul class="sectlevel3">
<li><a href="#_introduction">B.1.1. Introduction</a></li>
<li><a href="#_geotiff_design_considerations">B.1.2. GeoTIFF Design Considerations</a></li>
<li><a href="#_geotiff_software_requirements">B.1.3. GeoTIFF Software Requirements</a></li>
<li><a href="#_geotiff_file_and_key_structure">B.1.4. GeoTIFF File and "Key" Structure</a></li>
</ul>
</li>
<li><a href="#_coordinate_reference_systems_in_geotiff">B.2. Coordinate Reference Systems in GeoTIFF</a>
<ul class="sectlevel3">
<li><a href="#_device_space_and_geotiff">B.2.1. Device Space and GeoTIFF</a></li>
<li><a href="#_raster_space">B.2.2. Raster Space</a></li>
<li><a href="#_model_coordinate_reference_systems_model_space">B.2.3. Model Coordinate Reference Systems (Model space)</a></li>
</ul>
</li>
<li><a href="#_defining_model_coordinate_reference_systems">B.3. Defining Model Coordinate Reference Systems</a>
<ul class="sectlevel3">
<li><a href="#_standard_model_coordinate_reference_systems">B.3.1. Standard Model Coordinate Reference Systems</a></li>
<li><a href="#_user_defined_model_coordinate_reference_systems">B.3.2. User-defined Model Coordinate Reference Systems</a></li>
</ul>
</li>
<li><a href="#_model_crs_reference_parameters">B.4. Model CRS Reference Parameters</a>
<ul class="sectlevel3">
<li><a href="#_epsg_coding_of_objects">B.4.1. EPSG coding of objects</a></li>
</ul>
</li>
<li><a href="#_coordinate_transformations">B.5. Coordinate Transformations</a></li>
<li><a href="#_geotiff_tags_for_coordinate_transformations">B.6. GeoTIFF Tags for Coordinate Transformations</a></li>
<li><a href="#_cookbook_for_defining_transformations">B.7. Cookbook for Defining Transformations</a></li>
<li><a href="#_geocoding_raster_data">B.8. Geocoding Raster Data</a></li>
</ul>
</li>
<li><a href="#_geotiff_map_projection_method_codes_normative">Annex C: GeoTIFF Map Projection Method codes (Normative)</a>
<ul class="sectlevel2">
<li><a href="#_map_projection_methods">C.1. Map Projection methods</a></li>
<li><a href="#_map_projection_parameters">C.2. Map Projection parameters</a></li>
</ul>
</li>
<li><a href="#_recommendations_for_including_height_in_model_crs_definitions_informative">Annex D: Recommendations for including height in model CRS definitions (Informative)</a>
<ul class="sectlevel2">
<li><a href="#_introduction_2">D.1. Introduction</a></li>
<li><a href="#_compound_crss">D.2. Compound CRSs</a></li>
<li><a href="#_geographic_3d_crs_case_of_ellipsoidal_height">D.3. Geographic 3D CRS (case of ellipsoidal height)</a></li>
</ul>
</li>
<li><a href="#_summary_of_geokey_ids_and_names">Annex E: Summary of GeoKey IDs and names</a></li>
<li><a href="#_examples">Annex F: Examples</a>
<ul class="sectlevel2">
<li><a href="#_introduction_3">F.1. Introduction</a></li>
<li><a href="#_common_examples">F.2. Common Examples</a>
<ul class="sectlevel3">
<li><a href="#_utm_projected_aerial_photo">F.2.1. <em>UTM Projected Aerial Photo</em></a></li>
<li><a href="#_united_states_state_plane_zone">F.2.2. United States State Plane zone</a></li>
<li><a href="#_lambert_conformal_conic_aeronautical_chart">F.2.3. Lambert Conformal Conic Aeronautical Chart</a></li>
<li><a href="#_dma_adrg_raster_graphic_map">F.2.4. DMA ADRG Raster Graphic Map</a></li>
</ul>
</li>
<li><a href="#_less_common_examples">F.3. Less Common Examples</a>
<ul class="sectlevel3">
<li><a href="#_unrectified_aerial_photo_known_tiepoints_in_degrees">F.3.1. Unrectified Aerial photo, known tiepoints, in degrees.</a></li>
<li><a href="#_rotated_scanned_map">F.3.2. Rotated Scanned Map</a></li>
<li><a href="#_digital_elevation_model">F.3.3. Digital Elevation Model</a></li>
<li><a href="#_spherical_moon_example">F.3.4. Spherical Moon Example</a></li>
</ul>
</li>
</ul>
</li>
<li><a href="#_deprecated_and_deleted_epsg_codes">Annex G: Deprecated and deleted EPSG codes</a></li>
<li><a href="#_backward_compatibility">Annex H: Backward compatibility</a></li>
<li><a href="#_revision_history">Annex I: Revision History</a></li>
<li><a href="#Bibliography">Annex J: Bibliography</a></li>
</ul>
</div>
<div style="page-break-after: always;"></div>
<div class="paragraph">
<p><strong class="big">i. Abstract</strong></p>
</div>
<div class="paragraph">
<p>This profile specifies the requirements and encoding rules for using the Tagged Image File Format (TIFF) for the exchange of georeferenced imagery. It formalizes the existing community standard for the
Geographic Tagged Image File Format (GeoTIFF) file format.</p>
</div>
<div class="paragraph">
<p><strong class="big">ii. Keywords</strong></p>
</div>
<div class="paragraph">
<p>The following are keywords to be used by search engines and document catalogues.</p>
</div>
<div class="paragraph">
<p>ogcdoc, OGC document, geotiff, tiff</p>
</div>
<div class="paragraph">
<p><strong class="big">iii. Preface</strong></p>
</div>
<div class="paragraph">
<p>The GeoTIFF format was initially developed during the early 1990’s (N. Ritter & Ruth, 1997) in order to leverage a mature platform independent file format (TIFF) by adding metadata required for describing and using geographic image data. TIFF met the requirements for an underlying format, as it was lossless and extensible. In September 1994, SPOT Image Corp proposed a GeoTIFF structure that was limited to Universal Transverse Mercator (N. Ritter & Ruth, 1997). The proposed GeoTIFF specification was augmented and formalized by Ritter and Ruth as Revision 1.0, specification version 1.8.2 in November 1995 (N. Ritter & Ruth, 1995), with minor adjustments published in 2000, available at <a href="http://geotiff.maptools.org/spec/geotiffhome.html" class="bare">http://geotiff.maptools.org/spec/geotiffhome.html</a>, which is the official GeoTIFF specification version 1.0.</p>
</div>
<div class="paragraph">
<p>The GeoTIFF format is used throughout the geospatial and earth science communities to share geographic image data. That usage inevitably leads to identification of new requirements and needs for profiles, extensions, and improvements to the original GeoTIFF Specification. The OGC is well established as a forum for standardization in the GeoTIFF producer and user communities and, as such, it provides an inclusive standardization process for those communities. This document is the first step in the process of integration of the GeoTIFF specification into that standardization process, with the adjustment of a minor revision in order to allow the use of modern EPSG register, allowing backward compatibility with Revision 1.0. Moving forward within the OGC, the standard can be evolved using a formal process.</p>
</div>
<div class="paragraph">
<p>Suggested additions, changes, and comments on this standard are welcome and encouraged. Such suggestions may be submitted by email message or by submitting an official OGC Change Request using the online CR application:</p>
</div>
<div class="literalblock">
<div class="content">
<pre>http://www.opengeospatial.org/standards/cr</pre>
</div>
</div>
<div class="paragraph">
<p>Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The Open Geospatial Consortium shall not be held responsible for identifying any or all such patent rights.</p>
</div>
<div class="paragraph">
<p>Recipients of this document are requested to submit, with their comments, notification of any relevant patent claims or other intellectual property rights of which they may be aware that might be infringed by any implementation of the standard set forth in this document, and to provide supporting documentation.</p>
</div>
<div class="paragraph">
<p><strong class="big">iv. Submitting organizations</strong></p>
</div>
<div class="paragraph">
<p>The following organizations submitted this Document to the Open Geospatial Consortium (OGC):</p>
</div>
<div class="paragraph">
<p>The HDF Group</p>
</div>
<div class="paragraph">
<p><strong class="big">v. Submitters</strong></p>
</div>
<div class="paragraph">
<p>All questions regarding this submission should be directed to the editor or the submitters:</p>
</div>
<table class="tableblock frame-all grid-all stretch">
<colgroup>
<col style="width: 50%;">
<col style="width: 50%;">
</colgroup>
<tbody>
<tr>
<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Name</p></td>
<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Affiliation</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Emmanuel Devys</p></td>
<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock">IGN</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Ted Habermann</p></td>
<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock">The HDF Group</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Charles Heazel</p></td>
<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Heazeltech LLC</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Roger Lott</p></td>
<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock">International Association of Oil & Gas Producers (IOGP)</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Even Rouault</p></td>
<td class="tableblock halign-left valign-top" style="background-color: #FFFFFF;"><p class="tableblock">Spatialys</p></td>
</tr>
</tbody>
</table>
</div>
</div>
<div class="sect1">
<h2 id="_scope"><a class="anchor" href="#_scope"></a>1. Scope</h2>
<div class="sectionbody">
<div class="paragraph">
<p>This OGC<strong>®</strong> Standard defines the Geographic Tagged Image File Format (GeoTIFF) file format by specifying the content and structure of a group of industry-standard tag sets for the management of georeferenced or geocoded raster imagery using Aldus-Adobe’s public domain Tagged Image File Format (TIFF). This specification provides the requirements to which every GeoTIFF file must adhere.
GeoTIFF defines a set of TIFF tags provided to describe all "Cartographic" information associated with TIFF imagery that originates from satellite imaging systems, scanned aerial photography, scanned maps, digital elevation models, or as a result of geographic analyses. Its aim is to allow means for tying a raster image to a known model space or earth-based coordinate reference system, and for describing those coordinate reference systems.</p>
</div>
<div class="paragraph">
<p>The tags documented in this specification are to be considered completely orthogonal to the raster-data descriptions of the TIFF specification, and impose no restrictions on how the standard TIFF tags are to be interpreted, which color spaces or compression types are to be used, etc.</p>
</div>
<div class="paragraph">
<p>This minor revision of GeoTIFF focuses on updating the current GeoTIFF community specification and aligning it with current OGC standardization practice, as well as enabling the use of coordinate reference systems that have been included in EPSG register since the GeoTIFF 1.0 specification dating from 1995. It should therefore be backward compatible with the 1.0 version, both for coordinate reference systems based on EPSG register codes, or user-defined coordinate reference systems. <a href="#">Backward compatibility</a> documents this backward compatibility and evolutions of this revision 1.1.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_conformance"><a class="anchor" href="#_conformance"></a>2. Conformance</h2>
<div class="sectionbody">
<div class="paragraph">
<p>This standard defines 150 Requirements grouped into 31 Requirements Classes.</p>
</div>
<div class="paragraph">
<p>These Requirements address five (5) standardization target types:</p>
</div>
<div class="ulist">
<ul>
<li>
<p>Underlying TIFF Requirements</p>
</li>
<li>
<p>GeoTIFF Configuration GeoKeys</p>
</li>
<li>
<p>Raster to Model Coordinate Transformation Requirements</p>
</li>
<li>
<p>Requirements for definition of Model CRS when the Model CRS is from GeoTIFF CRS register</p>
</li>
<li>
<p>Requirements for definition of user-defined Model CRS</p>
</li>
</ul>
</div>
<div class="paragraph">
<p>Conformance with this standard shall be checked using all the relevant tests specified in Annex A (normative) of this document. The framework, concepts, and methodology for testing, and the criteria to be achieved to claim conformance are specified in the OGC Compliance Testing Policies and Procedures and the OGC Compliance Testing web site.</p>
</div>
<div class="paragraph">
<p>In order to conform to this OGC® encoding standard, a software implementation shall comply with all of the conformance classes specified in Annex A (normative).</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_references"><a class="anchor" href="#_references"></a>3. References</h2>
<div class="sectionbody">
<div class="paragraph">
<p>The following normative documents contain provisions that, through
reference in this text, constitute provisions of this document. For
dated references, subsequent amendments to, or revisions of, any of
these publications do not apply. For undated references, the latest
edition of the normative document referred to applies.</p>
</div>
<div class="ulist">
<ul>
<li>
<p>Association Adobe Developers, <strong><em>TIFF Specification Revision 6.0</em></strong>, June 3, 1992</p>
</li>
<li>
<p>OGC Abstract Topic 2: Referencing by coordinates (equivalent to ISO 19111:2019 Geographic information — Referencing by coordinates)</p>
</li>
</ul>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_terms_and_definitions"><a class="anchor" href="#_terms_and_definitions"></a>4. Terms and Definitions</h2>
<div class="sectionbody">
<div class="paragraph">
<p>For the purposes of this document, the following additional terms and definitions apply.</p>
</div>
<div class="admonitionblock note">
<table>
<tr>
<td class="icon">
<div class="title">Note</div>
</td>
<td class="content">