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How to classify (unsupervised) a single panchromatic satellite imagery in Grass GIS. I tried it many times but kept asking me for a second image or other images in the sub-group (band 1-2-3 etc). but the image I am using is a landsat black & white only. أكثر...

At the same zoom level, the scale bar of a map from Google Maps API (v3) can have different sizes. Here are two screenshots I took at the same zoom level on the same map at two different locations. Indianapolis Cambridge (UK) You can try it yourself on this page (go to the second map, the one...

I need to specify a "group by" clause for UpdateCursor arcpy.da. From here I found out that it's possible to do using an optional pair of SQL prefix and postfix. But there are no examples and I'm stuck with the syntaxis problem. Can, please, smbd help me? PS. I've tried various modifications of...

Here is what I have so far... import arcpyimport arcpy.mapping as mapmxd = map.MapDocument()mxd.save()And yes I know that map.MapDocument requires an argument, but I want it to automatically select the currently open mxd, and overwrite it. If I can't get it to select the currently open mxd I...

I converted a shapefile to kml using ogr2ogr. Glancing at the output, it looks correct -- it has a and each references the schema (I uploaded a snippet here). However, when I open the kml in QGIS and select "View attribute table", I only see a default list of attributes (Name, description...

I am writing a QGIS Plugin and wish to obtain data from a PostGIS table using the Group By clause using something like the following code: uri = QgsDataSourceURI()uri.setConnection('localhost', '5432', 'postgis', 'postgres', 'xxx')Query="select param_id, st_union(the_geom) as the_geom from...

I have been tasked with processing USGS's National Hydrography Dataset. However, it appears that the only available format is FileGDB (version 9.2-9.3.1). Looking at OGRs support for FileGDB, it looks like they only support those created by ArcGIS 10 and above. Does anybody have any ideas how I...

Is it possible to export labels based on Shapefile attributes into a DXF file? I use Quantum gis in Version 1.7.4.I've been reading a CSV file and view it as a Shape Layer.With the help of attributes from the File I will label the points.Now I want a DXF export with the labels.However, only the...

I have a .NET application that typically uses the standard Google Maps JavaScript API V2. Within this application I am using a GTileLayerOverlay to add my own custom dynamic tile layer. function addJourneyLineOverlay(assetId, startDate, finishDate) { var path = "http://"; if...

I have just installed service Pack 3 for ArcGIS 10 Desktop. Normally I use the new snapping environment, so I am unsure whether this is a new issue with SP3 or if it has been the case the whole time. I want to cut a polygon in layer 1 using a trace on overlapping polygons from layer 2. So to...

I have written a Python script for ArcMap 10 that uses the x/y coords from a shapefile to create perpendicular transects to the existing line. Since these shapefiles are actually rivers the lines are very curved. In order to accurately represent the river's shape there are more points in the...

Append and Merge tools issues in Arc 10. keep getting error 000278 - failed on input OID ...... (could not write value to one field or the other). Does anyone know how to fix this? Never had this problem in Arc 9.3, where if the value did not fit, it would get chopped off. أكثر...

I am the youngest of three boys raised by a working single mom in the 1960s and1970s.* We lived toward the poor end of the spectrum, so much of my childhood was spent devoid of television (back in those days, TV was considered a luxury, not a necessity).* Due to these circumstances, I was well...

NETGATE Registry Cleaner 9.0.805.0 NETGATE Registry Cleaner cleans and defragment your registry, speed-up your PC, removes unneeded files on disks, removes activity traces. It includes Startup manager to manage programs started at Windows startup and Uninstall manager for handy...

I am trying to open a netCDF file using Gdal library in python 3, under win 7. Couldn't understand why this line of code return None value. r=gdal.Open('NETCDF:"D:\Fire_codes\hum.nc":elevation')When I use gdalinfo command, I get the following...

We have added a specific AD group to the publisher role on our ArcGIS Server, which is version 10.1. We also created a folder that has its security settings restricted to this same AD group. We would like this group to have the ability to publish services, but restrict their ability to...

I have created the following script to mimic the ArcGIS 3D Analyst tool, FeatureTo3DByAttribute, which creates a 3D copy of a 2D feature class and sets the Z to a specified attribute. import arcpy, osfrom arcpy import env# Parametersin_features = arcpy.GetParameterAsText(0) #Feature...

I am able to grant multiple privileges (SELECT, INSERT, UPDATE, DELETE) to multiple Users/Roles to one single Table each time on an Enterprise Geodatabase from ArcCatalog 10.1. That's done by Manage -> Privileges... for each Table. Now that I have got a large number of Tables/Views, just...

I'm trying to streamline a model that identifies all zones that intersect each parcel in our Local Government Area (eg. Parcel x has Zone B1, B2 and E4). I am trying to make use of iterators in ArcGIS10. The problem is in bold italics below; I have a Zones layer and a Parcels layer. I select...

How can I measure the area of a polygon resulting from the intersection of two other polygons? If I use the measure tool or open the attribute table for the resulting polygon, it shows me the areas of the original two polygons... أكثر...