ISO Canada Landcover - Derived from AVHRR Data Product Specifications. Revision: A

Transcription

1 ISO Canada Landcover - Derived from AVHRR Data Product Specifications Revision: A

2 Data product specifications: Canada Landcover - Derived from AVHRR - Table of Contents- 1. OVERVIEW Informal description Data product specification - metadata Terms and definitions Abbreviations SPECIFICATION SCOPE DATA PRODUCT IDENTIFICATION Data series identification Data product identification Canada Landcover - Derived from AVHRR Canadian Agricultural Extents - Derived from AVHRR DATA CONTENT AND STRUCTURE Feature-based application schema Feature catalogue Canada Landcover Derived from AVHRR Feature attributes Feature Code REFERENCE SYSTEMS Spatial reference system Temporal reference system DATA QUALITY Completeness Logical consistency Positional accuracy Temporal accuracy Thematic accuracy Lineage statement DATA CAPTURE DATA MAINTENANCE PORTRAYAL DATA PRODUCT DELIVERY METADATA Page 2 of 11

3 Data product specifications: Canada Landcover - Derived from AVHRR / Spécifications de contenu informationnel 1. OVERVIEW 1.1. Informal description The data set was derived from the Advanced Very High Resolution Radiometer (AVHRR) sensor operating on board the United States National Oceanic and Atmospheric Administration (NOAA) satellites which have a resolution of 1.1 km. The vegetation and land cover data set includes twelve categories, all interpreted from the AVHRR imagery Data product specification - metadata This section provides metadata about the creation of this data product specification Data product specification title: Data product specification - reference date: Data product specification - responsible party: Data product specification language: Data product specification - topic category: Canada Landcover - Derived from AVHRR Agriculture and Agri-Food Canada English, French Imagery/Base Maps/Earth Cover 1.3. Terms and definitions Feature attribute characteristic of a feature Class description of a set of objects that share the same attributes, operations, methods, relationships, and semantics [UML Semantics] NOTE: A class does not always have an associated geometry (e.g. the metadata class). Feature abstraction of real world phenomena Object entity with a well-defined boundary and identity that encapsulates state and behaviour [UML Semantics] NOTE: An object is an instance of a class. Package grouping of a set of classes, relationships, and even other packages with a view to organizing the model into more abstract structures 1.4. Abbreviations Page 3 of 11

4 AAFC AVHRR NOAA Agriculture and Agri-Food Canada Advanced Very High Resolution Radiometer United States National Oceanic and Atmospheric Administration 2. SPECIFICATION SCOPE This data specification has only one scope, the general scope. NOTE: The term specification scope originates from the International Standard ISO Specification scope does not express the purpose for the creation of a data specification or the potential use of data, but identifies partitions of the data specification where specific requirements apply. Page 4 of 11

5 3. DATA PRODUCT IDENTIFICATION 3.1. Data series identification Title Alternate Title Abstract Purpose Topic Category Spatial Representation Type Canada Landcover and Agricultural extents- Derived from AVHRR This series of datasets, Canada Land cover and Agricultural extents were derived from the Advanced Very High Resolution Radiometer (AVHRR) sensor operating on board the United States National Oceanic and Atmospheric Administration (NOAA) satellites which have a resolution of 1.1 km. In mapping the vegetation and land cover categories, the NOAA AVHRR imagery permitted a new generation of data of subcontinental scale to be developed directly from imagery acquired from space platforms. Imagery/Base Maps/Earth Cover Vector Spatial Resolution 1: Geographic Description Canada Supplemental Information Constraints Data are subject to the Government of Canada Open Data License Agreement: Keywords Thesaurus: Government of Canada Core Subject Thesaurus Date: February 1, 2000 Keywords: Land management, Remote sensing Scope identification series 3.2. Data product identification Canada Landcover - Derived from AVHRR Title Page 5 of 11 Alternate Title Abstract Purpose Canada Landcover - Derived from AVHRR (LCV_CA_AGEXTENT_AVHRR) The Canada Landcover Derived from AVHRR dataset was derived from the Advanced Very High Resolution Radiometer (AVHRR) sensor operating on board the United States National Oceanic and Atmospheric Administration (NOAA) satellites. The vegetation and land cover information set has been classified into twelve categories. AVHRR Land Cover Data approximates a 1:2M scale and was done originally for Agriculture Canada. In mapping the vegetation and land cover categories, the NOAA AVHRR imagery permitted a new generation of data of subcontinental scale to be developed directly from imagery acquired from space platforms. It proved to be a viable alternative to the revious data sources, such as large-scale aerial photography, LANDSAT imagery, or secondary sources based on ground observations. In merging the NOAA AVHRR product with GIS, the

6 Topic Category Spatial Representation Type project demonstrated practical solutions for converting raster-based RS sources into vector-based inputs into GIS Imagery/Base Maps/Earth Cover Vector Spatial Resolution 1: Geographic Description Canada Supplemental Information Information on the NOAA series of satellites can be found at Information on the classification of the vegetation and land cover, raster to vector conversion, generalization for cartographic presentations is included in the paper "The Canada Vegetation and Land Cover: A Raster and Vector Data Set for GIS Applications - Uses in Agriculture" ( A soil quality evaluation was obtained by cross-referencing the AVHRR information with Census of Agriculture records and biophysical (Soil Landscapes of Canada) data and is also included in the above paper. Constraints Data are subject to the Government of Canada Open Data License Keywords Scope Identification Thesaurus: Government of Canada Core Subject Thesaurus Date: February 1, 2000 Keywords: Land management, Remote sensing dataset Feature Attribute Names Feature Code, Colour Canadian Agricultural Extents - Derived from AVHRR Title Alternate Title Abstract Purpose Topic Category Spatial Representation Type Canadian Agricultural Extents - Derived from AVHRR (AGR_CA_AGEXTENT_AVHRR) The Canadian Agricultural Extents Derived from AVHRR dataset was derived from the Advanced Very High Resolution Radiometer (AVHRR) sensor operating on board the United States National Oceanic and Atmospheric Administration (NOAA) satellites. The data were classified into vegetation land cover categories and converted to vector polygons. Areas less than 50 km sq. were eliminated Data was developed as one of four interpretations of the agricultural land extent across Canada. This particular product was created for analysis purposes, to allow the user to see the areas where significant cropland and rangeland areas occur across Canada, according to the AVHRR. Farming Vector Spatial Resolution 1: Geographic Description Canada Supplemental Information Information on the NOAA series of satellites can be found at Information on the classification of the vegetation and land cover, raster to vector conversion, Page 6 of 11

7 Constraints Keywords Scope Identification generalization for cartographic presentations is included in the paper "The Canada Vegetation and Land Cover: A Raster and Vector Data Set for GIS Applications - Uses in Agriculture" ( A soil quality evaluation was obtained by cross-referencing the AVHRR information with Census of Agriculture records and biophysical (Soil Landscapes of Canada) data and is also included in the above paper. Data are subject to the Government of Canada Open Data License Thesaurus: Government of Canada Core Subject Thesaurus Date: February 1, 2000 Keywords: Land management, Remote sensing, Agriculture, Crops dataset Feature Attribute Names 4. DATA CONTENT AND STRUCTURE 4.1. Feature-based application schema Figure Canada Landcover UML Class Diagram Page 7 of 11

8 Agriculture and Agri-food Canada Data Product Specification (ISO 19131) 4.2. Feature catalogue Canada Landcover Derived from AVHRR Title Canada Landcover Derived from AVHRR Feature Catalogue Scope Canada Landcover Data Version Number 1 Version Date Producer Agriculture and Agri-Food Canada, Government of Canada System-generated attributes (for example, OBJECTID, Shape, Shape Length and Area) are not defined in the feature catalog Feature attributes Feature Code Name Feature Code (F_CODE) Definition Aliases Producer Value Data Type Vegetation land cover type. Government of Canada, Natural Resources Canada, Earth Science Sector, Data Management and Dissemination Branch. Integer Value Domain Type 1 Value Domain Feature Attribute Value Label Code Definition Water 4 Mixed Forest Deciduous Forest Transitional Forest Continuous forest in which 26-75% of the canopy is composed of coniferous or broadleaf trees. Continuous forest in which % of the canopy is composed of broadleaf trees. A mixture of land cover classes where tree cover is discernible but forest land occupies less than 50% of the area. Page 8 of 11 5 Coniferous Forest Continuous forest in which % of the canopy is composed of

9 Agriculture and Agri-food Canada Data Product Specification (ISO 19131) coniferous trees. 6 Tundra Low arctic or alpine vegetation with discernible cover. Although generally located beyond the tree line 7 Barren Land Land without discernible vegetation cover. May include sand 8 Permanent Ice or Snow 9 Agriculture- Cropland 10 Agriculture- Rangeland Perennial snow fields and glaciers. Cultivated land with crops Land supporting native vegetation 11 Built-Up Area Cities and towns of sufficient size to be depicted at the scale of mapping. Name COLOUR Definition Aliases Producer Original ArcInfo look-up table symbol/colour code Government of Canada, Natural Resources Canada, Earth Science Sector, Data Management and Dissemination Branch. Value Data Type Integer Page 9 of 11 Value Domain Type 1 Value Domain Feature Attribute Value Label Code Definition Built-up Area Agriculture - Rangeland Agriculture - Cropland Tansitional Forest Tundra Coniferous Forest

10 Agriculture and Agri-food Canada Data Product Specification (ISO 19131) 13 Barren Land 14 Mixed Forest 15 Deciduous Forest 16 Water 17 Sea Ice - Polar Cap 5. REFERENCE SYSTEMS 5.1. Spatial reference system Horizontal coordinate reference system: WGS 84 Map projection: Web Mercator Auxiliary Sphere; EPSG: 3857; Version Temporal reference system Gregorian calendar 6. DATA QUALITY 6.1. Completeness Measure not used at this time 6.2. Logical consistency Measure not used at this time 6.3. Positional accuracy Measure not used at this time 6.4. Temporal accuracy Measure not used at this time 6.5. Thematic accuracy Measure not used at this time 6.6. Lineage statement Lineage Statement The vegetation AND land cover data set was generated from NOAA AVHRR imagery. Approximately 45 images spanning several years (summer coverage, ) were selected to produce a cloud-free composite for the entire country suitable for classification and interpretation. More specifically, the composite was derived from a combination of the red and near-infrared channels. The image was classified using a combination of supervised, automated, "maximum likelihood", and manual classifications. Classified images were then subjected to filtering in order to reduce visual noise. In general, a minimum area of 4 contiguous pixels was retained. (Exceptions were isolated patches where single pixels of a class were retained if they were located more than 7 pixels inside the boundary of a larger polygon of a different class). Manual editing was Page 10 of 11

11 Agriculture and Agri-food Canada Data Product Specification (ISO 19131) Scope used to supplement automated techniques and to incorporate changes from the review and verification process. The final data set was assembled digitally by merging the interpreted image data in raster format with selected National Atlas base map components in vector format. Series 7. DATA CAPTURE 8. DATA MAINTENANCE No Maintenance 9. PORTRAYAL Not applicable. 10. DATA PRODUCT DELIVERY File Geodatabase format name: Esri Geodatabase (File-based) format version: 10.1 specification: A collection of various types of GIS datasets held in a file system folder. ( languages: eng character set: utf8 11. METADATA The metadata requirements follow the Government of Canada s Treasury Board Standard on Geospatial Data (ISO 19115). Page 11 of 11