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While skimming the union function I could see it works with intersecting bounding boxes, layer features and attributes. But how, exactly does this function work; which are the lines that check for intersection, compose new features, adds the attributes to those features, etc? أكثر...

I'm using the following python code to replace Null values by 0, using field calculator: def nulls(p1): if p1 is None: return 0 else: return p1But notting happens, Null values stay. I'm using ArcGIS 10.0 أكثر...

In Geoserver, I try to save a SLD file containing this Rule: image/png 0.9 14 The vaildator complains like this: line -1: The reference to entity "id" must end with the ';' delimiter. The problem seems to be the & in the url, which leads to...

We have recently got a bit behind on updating our 3D imagery KML file. Part of the reason for this is the complexity of dealing with new areas that are extensions of already existing imagery. Columbus, Ohio, got expanded 3D imagery (2). What you see above is what we want to appear in the...

I use data driven pages to produce several maps. In the end product, all maps should show point data on a Country of europe. So far the country is shifting around each time I change the data shown in the map. However, I want the country to stay in the middle of the map when I export the maps...

I ordered landsat 8 surface reflectance high level data products via Espa: http://espa.cr.usgs.gov/ordering/new. Is it correct that there is no surface reflectance panchromatic band available after processing? أكثر...

I currently have some scripts that use OGR2OGR to translate data form various source formats like ESRI Shapefile, GML etc to other file formats but especially to my PostGIS database. My normal command would be: ogr2ogr -f PostgreSQL PG:"pg conn settings" shapefile.shpI now need to do this in a...

I have converted a CAD file to GIS format using GIS (from .dgn to .shp)... In one layer I have polygons in which a smaller one is on top of the larger polygon. I can see both polygons however when I select the smaller polygon, the software automatically selects both the smaller polygon and the...

Selection exceeds the maximum allowed per request download limit cannot download more than a max of 20 rasters at time I couldn’t figure out why the when I select more than 20 raster and try to download them form a mosaic dataset I got the following message?!“Selection exceeds the maximum...

I am a bit surprised this hasn't been asked before and googling did not help me either. So go ahead and flag as duplicate if I just did not use the right vocabulary... I have a dataset with point data within a given country. Let's say my dataset looks somewhat like this: tree_id | species |...

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The maps depict the percentage of Hispanic Population by county across the US with overlays of Territories gained from Mexico in the later half of the 19th century. I've done this for both the 2000 and 2010 censuses. I'd like some feedback on the format, layout, colors choices, etc...

I am looking at using the traditional arc-node topological data structure to make some spatial data analysis more efficient. I would like to avoid reinventing the wheel. Is there an implementation in any (preferably open-source) Python spatial data package where I could build and access the...

I would like to create a layer in ArcGIS containing polylines, that are rendered by combination of more than one attibute. I can create layer where the polylines are of different thickness or different color. But what if I want to make combination of the attributes? It there a way to present a...

I would like to make my UI more responsive, thus I would like to put my controls in one div so they know about each other. أكثر...

Let's say I have an Oracle database table with latitudes and longitudes. I don't have access to modify the schema of this table, or even create tables. However, I can create views and indexes on those views. I purpose the following problem: Can I create a view that takes in two fields, and...

This lesson shows how to download OSM data from InaSAFE in Qgis 2.8 أكثر...

My ouput should be a series of cross-sections (10 meters apart) along a center line of a river. The input data is a raster data set with elevation values. Can I also automatically generate the lines where my cross sections should be which is at 10-meter regular interval and along a specific...

I am trying to find out an good method to transform several DWG (CAD) files to MBTiles raster format for indoor mapping purposes. I managed to transform a few, but currently the process is very time consuming. What I currently do goes as follows: I use FME to select only the relevant...

I have done a ton of research on the most accurate transformation to use in mainland Alaska to convert between the NAD83 and WGS84 datums, but I just can't seem to find a definitive answer. ArcMap gives 3 options for my area of interest: WGS_1984_(ITRF00)_To_NAD_1983 This one I am...