Custom map overlay

[mzur]

Users should be able to upload a custom map overlay (e.g. a detailed ocean map of the transect area) for a transect. This overlay can be used in the transect map.

[mzur]

The geo overlay upload will eventually support different formats to provide geospatial information for the image:

1. Plain: The longitude and latitude of the top left and bottom right pixels in WGS84. These will be entered in plain form fields and submitted along with the image file.
2. World file: A world file containing geospatial information that will be submitted along with the image file. Compute the latitude and longitude like this (see x1 and y1).
3. GeoTIFF: A single GeoTIFF file that contains all geospatial information on its position as well as the image data. This will resolve part of BiodataMiningGroup/biigle-volumes#25.

[mzur]

Basic support for geo overlays is now implemented. This includes the "plain" upload (1.) mentioned above. The result looks like this:

Edit panel:

World map:

The next steps can be:

• Implement support for the formats 2. and 3. mentioned above.
• Implement a new sidebar in the geo view where the visibility of the different overlays can be toggled.
• Implement support for rotated geo overlays? It may be relatively easy to export the correct images from other GIS software but is hard to implement rotated overlays in Biigle so we might choose not to do this.

[dlangenk]

Is it possible to have multiple layers? If this is not possible there is probably no need for visibility control for the overlay. I would choose not to implement the rotated geo overlays as this can be easily done in a gis system.

[mzur]

You can have multiple layers, yes.

[dlangenk]

Than it would be indeed helpful but not urgent at the moment.

[mzur]

With the coming GIS connection #18 this feature is no longer required and will be removed (see #17).