Hi Eric,
you might try to use a /vsimem/ path. For example, save your image to
"/vsimem/myimage.tif" and
open it as QgsRasterLayer. I haven't tested it with gdal.Datasets, but
it works with with ogr.DataSources.
Probably you shouldn't overwrite or delete the "/vsimem" object while
QGIS has still a reference on it.
More details here:
https://gdal.org/user/virtual_file_systems.html#vsimem-in-memory-files
Greetings,
Benjamin
On 2021-03-03 00:00, Eric Younkin - NOAA Federal wrote:
Hello,
I've been trying to figure out how to draw grids and lines from numpy
arrays without driving to a raster/vector file first. I tried using
the gdal 'MEM' driver to make a gdal Dataset from a numpy array and
pass that in as a QgsRasterLayer, I get the following:
memobj
<osgeo.gdal.Dataset; proxy of <Swig Object of type 'GDALDatasetShadow
*' at 0x0000019B3131AC30> >
QgsRasterLayer(memobj, 'testlayer', 'gdal') Traceback (most recent
call last):
File "<input>", line 1, in <module>
TypeError: QgsRasterLayer(): arguments did not match any overloaded
call:
overload 1: too many arguments
overload 2: argument 1 has unexpected type 'Dataset'
The only other approach that I could find was:
https://gis.stackexchange.com/questions/201804/how-to-create-raster-layer-directly-from-numpy-array-in-qgis-without-saving-to
but I suspect that the return from the processing.run command is
probably a temp file, so it is still going to file. Is there not a way
to generate a raster layer from a numpy array without writing to file
first?
Thanks,
Eric
--
Eric Younkin
Physical Scientist
NOAA OCS, Hydrographic Systems and Technology Branch
1315 East-West Highway
N/CS11, Room 6604
Silver Spring, MD 20910
Office: 240-847-8208
Cell: 828-331-8197
_______________________________________________
QGIS-Developer mailing list
QGIS-Developer@lists.osgeo.org
List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer
Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer
--
--
Benjamin Jakimow, Doctoral Researcher
Earth Observation Lab | Geography Department | Humboldt-Universität zu
Berlin
e-mail: benjamin.jaki...@geo.hu-berlin.de
phone: +49 (0) 30 2093 6894
mobile: +49 (0) 157 5656 8477
fax: +49 (0) 30 2093 6848
mail: Unter den Linden 6 | 10099 Berlin | Germany
room: 2'222
_______________________________________________
QGIS-Developer mailing list
QGIS-Developer@lists.osgeo.org
List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer
Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer
