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zoran-cuckovic / QGIS-visibility-analysis

Quantum GIS plugin for visibility analysis
GNU General Public License v3.0
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QGIS 2.18.16: memory issue with high-altitude observers #26

Closed intelligeo closed 5 years ago

intelligeo commented 5 years ago

Hi, I tried to calculate some cumulative binary viewshed from observers like geostationary satellites at equator with a metric-projected dem.tif and I've the following message in the console:

2019-02-06T18:01:27 1 Traceback (most recent call last): File "C:/Users/me/.qgis2/python/plugins\ViewshedAnalysis\viewshedanalysis.py", line 197, in run Algo) File "C:/Users/me/.qgis2/python/plugins\ViewshedAnalysis\doViewshed.py", line 409, in Viewshed mx_vis = numpy.zeros((full_window_size, full_window_size)) ValueError: array is too big; arr.size * arr.dtype.itemsize is larger than the maximum possible size.

Can someone provide some help? Is there any type limitation to be considered? Thank you in advance for your answer. Kindly, Michael

zoran-cuckovic commented 5 years ago

Hello, Viewshed form a satelite? It is quite probable that your dem is too large to be handled by the plugin, if you take into account the entire globe ! (Calculations are mode on numpy arrays, which are limited in size by available live memory). Best!