ST_AsPNG — Return the raster tile selected bands as a single portable network graphics (PNG) image (byte array). If 1, 3, or 4 bands in raster and no bands are specified, then all bands are used. If more 2 or more than 4 bands and no bands specified, then only band 1 is used.

I have a raster which is split into 30 tiles and I want to dump them all into PNGs. I've read the documentation http://postgis.net/docs/RT_ST_AsPNG.html but still don't know how to dump it well. If i use ST_Histogram, i get numbers, think the …

Jun 28, 2016 · How to export postgis raster-based tables into a file in Linux. Suppose that you have a raster file (originally in GeoTif and it’s loaded into postgis with the cannonic ‘raster2pgsql’. Let’s assume that the raster table is called “testviirs”.

Mar 4, 2014 · PostGIS documentation have a chapter (5.3.1) with a "PHP Example Outputting using ST_AsPNG in concert with other raster functions": http://postgis.net/docs/using_raster_dataman.html#RT_PHP_Output

For smallish rasters the easiest is to output to a web-friendly raster format such as PNG using batteries included postgis raster functions like ST_AsPNG or ST_AsGDALRaster listed in PostGIS Raster output functions.

I am working with Postgres 9.6, PostGIS 2.3 and GDAL 1.11.5. I would like to output the union of some polygons as a single PNG (or other image) file, with the polygons in black on a white backgroun...

Oct 21, 2021 · Input parameters include a bounding box of the requested area, an SRID code and others, while the output of a WMS service is rendered images (usually PNGs, JPEGs or TIFFs).

Jul 14, 2020 · Now all working nicely - Apache, mod_tile, renderd, Mapnik and PostgreSQL with PostGIS. Now I want to create a program on Python for generating a PNG file with specific region (box). This region will be defined by coordinates (left and right corners of box).

You can import raster data using either raster2pgsql, which is part of the PostGIS distribution, or gdal_translate, which is part of GDAL. The raster2pgsql is usually easier for loading, as the options for controlling the load are exposed directly.

Dec 18, 2024 · I need a PostgreSQL function to return PNG, with parameters z, x, y. The function should be like: p_raster_type VARCHAR(32), z INTEGER, x INTEGER, y INTEGER. Note that, this function should combine all small tiles (256*256) and generate the exact PNG image defined by z, x, y. Know someone who can answer?