1.27. How to export data

Web GIS allows to export data from Vector layers and PostGIS layer in the following formats:

Depending on the format, additional file components are exported making further use of the exported data more convenient. For example CSVT (field structure description) and PRJ (coordinate system description) are added to CSV and CPG (codepage) to ESRI Shapefile.

To export data:

  1. Open the Properties page of Vector layer or PostGIS layer from which you want to export data;

  2. Select Vector layer ‣ Save as on the right side of Web GIS admin console;

  3. Save file in chosen format to your device.

In “Format” field select data format you need: CSV, DXF, ESRI Shapefile, GeoJSON or Mapinfo File:

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Pic. 1.101. “Format” field

In “SRS” field (Spatial reference system) in addition to standart coordinate systems Longitude-Latitude (EPSG: 4326) amd Mercator (EPSG: 3857) you can select custom coordinate systems created earlier (how to add custom SRS see this page):

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Pic. 1.102. “SRS” field

In “Encoding” field you can choose among UTF-8, Windows-1251, Windows-1252 encoding for your data:

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Pic. 1.103. “Encoding” field

“FID field” is used for setting a field name to be added to a exported data where the object identifiers will be placed (the default is “ngw_id”).

Next you can chose which of the fields of the data to keep in the file. By default, all are selected. To remove a field, click on the cross by its name or untick it in the drop-down menu. To add a field again, tick it in the drop-down menu.

../../_images/export_fields_en.png

Pic. 1.104. Selcting fields

Output in ESRI Shapefile or MapInfo TAB results in a Zip archive with necessary files. For single-file formats (like GeoJSON or CSV) creation of Zip archive is optional.

All export options are available through HTTP API.

For example, this inquiry will get you data in CSV format, EPSG:4326, UTF-8 encoding, zipped:

https://demo.nextgis.com/api/resource/4077/export?format=csv&srs=4326&zipped=true&fid=ngw_id&encoding=UTF-8

Note

Geometry and attributes data export is supported. Features’ descriptions, metadata and images can’t be exported in the described way but can be requested using NextGIS API.

Note

You can also export data from Vector layers with desktop app NextGIS QGIS.