Difference between revisions of "CEM How to generate tiles for leaflet basemap"
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== georeference a png image file == | == georeference a png image file == | ||
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| + | Install QGIS from qgis.org | ||
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| + | // With a png file, Create georeferenced tif image with QGIS | ||
| + | // >>QGIS dashboard-load openstreet map-georeferencer-pick coordinates from map to referencer-export tiff image | ||
| + | // Create tiles from the georeferenced image with gdal2tiles: (pip install gdal2tiles) | ||
| + | // gdal2tiles.py -e --zoom=6-16 georeference_image.tif output_folder | ||
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| + | Run QGIS | ||
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| + | Start a new project | ||
| + | first icon with a blank paper | ||
| + | load a map | ||
| + | Select XYZ Tiles and OpenStreetMap and zoom to region of interest | ||
| + | |||
| + | Load a png that needs to be geo-referenced | ||
| + | select Layer -> georeferencer | ||
| + | select open-raster and load the png file | ||
| + | |||
| + | Mark several map coordinates | ||
| + | select 'From Map Canvas' and mark the matching location at the background map(remember to click OK) | ||
| + | There will be a matching marker on the background map and georeferencer map | ||
| + | |||
| + | Georeference and Export a tif file | ||
| + | select georeferencing and exit | ||
== generate image tile set == | == generate image tile set == | ||
== add to leaflet's basemap collection == | == add to leaflet's basemap collection == | ||
Revision as of 17:51, 9 August 2024
Contents
create new basemap for leaflet
goal: to create leaflet basemap overlay layer
georeference a png image file
Install QGIS from qgis.org
// With a png file, Create georeferenced tif image with QGIS // >>QGIS dashboard-load openstreet map-georeferencer-pick coordinates from map to referencer-export tiff image // Create tiles from the georeferenced image with gdal2tiles: (pip install gdal2tiles) // gdal2tiles.py -e --zoom=6-16 georeference_image.tif output_folder
Run QGIS
Start a new project
first icon with a blank paper
load a map
Select XYZ Tiles and OpenStreetMap and zoom to region of interest
Load a png that needs to be geo-referenced
select Layer -> georeferencer
select open-raster and load the png file
Mark several map coordinates
select 'From Map Canvas' and mark the matching location at the background map(remember to click OK)
There will be a matching marker on the background map and georeferencer map
Georeference and Export a tif file
select georeferencing and exit
