![]() ![]() The core idea is to provide a specification for encoding geospatial data while remaining decodable by any JSON decoder.īeing a subset of the immensely popular JSON, the parsing support is on a different level than with Shapefile. It was developed 10 years ago by a group of enthusiastic GIS developers. GeoJSON is a subset of JSON (JavaScript object notation). Outputting the VESA Index data resulted in 5 files and a total of 139 megabytes of data, and 29 megabytes compressed. A minor nuisance is the limitation of the attribute field names to 10 characters and poor Unicode support, so some abbreviations and forcing to ASCII may have to be used. the row and column number of a value is significant. This is a compact format which is based on tabular thinking, i.e. Internally, Shapefile uses Well-known binary (WKB) for encoding the geometries. However, Shapefile has been around for so long that any GIS software supports handling it. ![]() This makes operating Shapefiles slightly clunky and confusing. The Shapefile in fact consists of several files: in addition to one file with the actual geometry data, another file for defining the coordinate reference system is needed, as well as a file for defining the attributes and a file to index the geometries. It is a standard first developed by ESRI almost 30 years ago, which is considered ancient in software development. ![]() Shapefile is the most widely known format for distributing geospatial data. The polygon geometries are fairly simple, containing 10-20 points in general. ![]() The data set contains a total of 637545 polygons with three properties: the actual VESA Index, development class of the forest stand, and shrub probability. But what if you were given the option to choose freely? Is there one file format that is technically superior to the others? Let's test! Dataįor testing, we took the vector data for the VESA Index ( read more) in North Karelia, Finland, and encoded it to each of the three file formats. Your choice of file format is likely based on the tools you have and the formats you are used to. We always aspire to provide a wide range of integration options at Terramonitor, and this is why we offer geospatial data download in Shapefile, GeoJSON and Geopackage formats. ![]()
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January 2023
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