GeoJSON: Difference between revisions

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GeoJSON is a file format for geographical data. It is a simple text-based format which can be read by humans, but also by computers. Any Geo Dataset in another format can be converted to the GeoJSON file format.


{{learned|what GeoJSON is|how GeoJSON relates to the Tygron Engine|what data can be read into the Tygron Engine|how to prepare your GeoJSON file|how to upload GeoJSON data into the Engine}}
==How to create a GeoJSON file==
To convert a Geo Dataset to a GeoJSON a GIS (Geographical Information System) can be used. ArcGIS Desktop is one example. An open-source alternative is QGIS.


==What is GeoJSON==
*Go to the documentation for [[How_to_create_a_GeoJSON_file_in_ArcMap|ArcGIS]]
GeoJson is a file format, which is meant to store data about geographical features (GIS data). It is a simple text-based format which can be inspected by humans, but is also readable by most GIS software.
*Go to the documentation for [[How_to_create_a_GeoJSON_in_QGIS|QGIS]]


==How GeoJSON relates to the Tygron Engine==
Also take a look at the [[Data_preparation|data preparation]] page for considerations and tips regarding importing geo data.  
[[Project]]s in the Tygron Engine consist of a number of spatial data layers, such as [[construction]]s, [[zone]]s, and [[land]]. When a project is newly created using the [[wizard]], much of this data is already aggregated from [[data sources|available data]]. However, it may be desirable to load additional data into the project. The Tygron Engine can read GeoJSON files for this purpose.


==When to use GeoJSON files==
====Notes====
The Tygron Engine creates projects using the wizard with a number of default data sources. However, some users or organisations may have data which is preferable or complementary to the data already present in the project. This may be for a number of reasons:
The GeoJSON file must conform to a number of prerequisites before it can be loaded properly. Files which do not conform to these prerequisites may not be loaded properly by the {{software}}. The requirements are:  
* The project takes place in a location for which there are no data sources connected by default
* The file must be saved in GeoJSON format
* The default data sources are not accurate or up-to-date enough
* The file must have a CRS (Coordinate Reference System) defined
* The project's intended starting situation is not the same as the real, current situation
* The file must use character encoding UTF-8.
* There is some form of data which is not covered by the Tygron Engine by default
* All desired attributes must be numerical, so that they can be loaded as valid [[attribute]] values. Attributes with text values are ignored when attempting to load them as attributes. See for steps, [[Data_preparation#Text_attributes|this page]].
In these situations, uploading a [[GeoJSON]] file
 
 
==How to import GeoJSON file==
<!--[[File:GeoJSON_received.jpg|framed|right|After either dragging and dropping the GeoJSON file, or selecting a file with the file-selection window, this window will appear.]]-->
Use the [[Geo Data Wizard]] for importing the created file. Select in step 1 the first option: ''Import a GeoJSON file'' and follow the steps in the wizard.
<br>
{{Template:GeoDataOverview}}
[[Category:Files]]

Latest revision as of 09:43, 30 January 2023

GeoJSON is a file format for geographical data. It is a simple text-based format which can be read by humans, but also by computers. Any Geo Dataset in another format can be converted to the GeoJSON file format.

How to create a GeoJSON file

To convert a Geo Dataset to a GeoJSON a GIS (Geographical Information System) can be used. ArcGIS Desktop is one example. An open-source alternative is QGIS.

  • Go to the documentation for ArcGIS
  • Go to the documentation for QGIS

Also take a look at the data preparation page for considerations and tips regarding importing geo data.

Notes

The GeoJSON file must conform to a number of prerequisites before it can be loaded properly. Files which do not conform to these prerequisites may not be loaded properly by the Tygron Platform. The requirements are:

  • The file must be saved in GeoJSON format
  • The file must have a CRS (Coordinate Reference System) defined
  • The file must use character encoding UTF-8.
  • All desired attributes must be numerical, so that they can be loaded as valid attribute values. Attributes with text values are ignored when attempting to load them as attributes. See for steps, this page.


How to import GeoJSON file

Use the Geo Data Wizard for importing the created file. Select in step 1 the first option: Import a GeoJSON file and follow the steps in the wizard.

Geo Data
Project Sources
Open data sources • GeoShare • Custom Geometry
Web
WFS • WMS • WCS • CSW • Map service
File
CityGML • DXF • GeoJSON • GeoTIFF • SLPK
Import
Vector • Raster • 2D spatial plan • 3D model (I3S, CityGML)
Export
Vector • Raster • GeoShare Viewer
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