Support alternative coordinate reference systems in .wld files #26
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This allows the export of a correct world file for projections other that 3857 but N.B. OziExplorer file still assumes this projection
|
Hi Greg, the merged PR #29 adds support for different projections. If you're still interested in this, could you please check how that change affects your task and your pull request? |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Hi and thanks very much for taking the time to create this useful script.
A bit of background... In Great Britain, Ordnance Survey maps (used by many hikers etc.) use the British National Grid (EPSG:27700). This system is widely used to specify co-ordinates and so it is useful to be able to use this coordinate reference system in Mapnik.
I have modified Nik4 to grab the SRS from the Mapnik XML stylesheet so that the
.wldfile contains the correct coordinates when using alternative coordinate reference systems such as the British National Grid. I've tested this with EPSG:3857 and EPSG:27700 maps by importing into QGIS and it appears to work. (If you save the world file with extension.pngwit is automatically used by QGIS when opening the PNG image.)Unfortunately exporting the relevant parameters for the SRS specified in the Mapnik stylesheet to an OziExplorer file (as I suggested in #25) is a bit much for me to get my head around, although this site explains the file format.