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Can you not try to inverse the max and min slope vlaues in QGIS, providing that is what software you are using. I use .asc files all the time, but not seen this issue.


Got it!!!! Still prompting a dialog during plugin run time, but independent of user and OS ## from qgis.analysis import * from PyQt4.QtGui import QFileDialog from os.path import expanduser ## ##path definition independent from user and os user_path = os.path.expanduser("~") overlayAnalyzer = QgsOverlayAnalyzer() intersection_result= ...


So after Joseph 's very very heplful comment and the link suggested the following is working in my plugin: ## from qgis.analysis import * from PyQt4.QtGui import QFileDialog ## ##path definition: code copied & pasted from _init_(self, iface) method ##from the plugin' s main module & CLASSNAME: the plugin' s classname locale = ...


ArcGIS Online Network Analysis services are based on road network data (from various vendors such as HERE/TomTom and some others in several countries) and do not include railways. You would need to obtain the data and build your own network dataset.

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