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I am migrating some users from MapInfo to QGIS, and before they sign off on it, they want a very simple address search in the same way that we currently have one working in MapBasic. I;ve been having a look around, but can;t seem to get my head around modifiying the quick find and find by...

I am trying to load a postgis linestring into python (using ST_DumpPoints) and extracting x,y,z coordinates, which is working but extremely slow..and if i mean slow, i really mean it (yes, it takes about 5 seconds per row, so imagine how long this is for around 5000 features).Funnily enough, if...

I am looking for a means, using PostGIS, of reconstituting a set of polygons from tens of thousands of smaller polygon 'pieces'. This is a simplified example, with the pieces shaded: Unfortunately the pieces do not have a common ID or other attribute of the larger polygons that would allow me...

I would like to have a color ramp instead of 10 categories of color when displaying my vector layer in the map composer of QGIS. Is it possible ? أكثر...

توفي إلى رحمة الله تعالى الدكتور جمال الشرقاوي الأستاذ بقسم تكنولوجيا التعليم بكلية التربية جامعة المنصورة وتم دفن جثمانه اليوم الموافق 6 أكتوبر 2015... أكثر...

I'm trying to select all files with 'Pkwy' or 'Hwy' And i cant use wild cards for whats before because its a large string of text, How do i find attributes based on a part of the text? أكثر...

One aspect of GIS that wasn't covered in my training was the best way to manage shapefiles within a project. In my hypothetical example I have a shapefile with a number of attributes. I want to produce a map comparing 4 different combinations of various attributes. So I want 4 map windows in...

I'm using Geotools 14.0 for Java and I'm trying to generate shapefile based on data from GeoJSON. Here is my code: try { String url = "geojson.json"; File geojson = new File(url); File shpFile = new File("test.shp"); ShapefileDataStoreFactory dataStoreFactory = new...

I have a question concerning creating the largest possible circle inside a polygon including its perimeter and area size. I created via minimum boundary geometry the smallest possible circle outside a polygon (see image) and want to do some calculation with its largest circle inside the polygon...

My input join field and output join field are text type, and my problem is that when I use "Add Join" all joins ok, but if I want to use "Join field" there are some records with Null, it seems like it doesn't recognize that the text are the same in fields from both tables. أكثر...

I have a series of raster files (150 or so) that I need to multiply by a baseline raster. Unfortunately, the series of rasters have a different cell size (30mx30m aka .00027777778 degrees x .00027777778 degrees) than the baseline file (.1 degree X .1 degree). I ran a test using qgis' raster...

As I delve deeper into GIS, I find myself trying to improve efficiencies of certain procedures and processes. The one process I'm working on now is spatially scheduling construction projects. For example, consider the two construction schedules outlined in the images below. The first one is...

The college I work for is considering revamping their intro to GIS course. Traditionally, they've used the ESRI suite but are now open to using other options. There are two factors responsible for the desire to make a change: The text book provided by ESRI. The instructors feel that the point...

We have some software as part of a larger project written using ArcObjects via .NET. This software migrates and merges data from multiple file geodatabases in one schema to a single file geodatabase in a similar but different schema. Some steps in the migration involve looking up an existing row...

I've set up GeoServer 2.1.4 and installed the feature-pregeneralized-2.1.4.jar plug in and processed my shape files into each of their separate folders with the generalized shapefiles and I've check these and they are correct. I've followed the tutorial and set up the shapefiles and configured...

This is the warning i am getting when i try to use this WPS service from QGIS,and the processing take a long time, but doesn't terminate, what might be the problem? 17 Oct 12:33:25 INFO [geoserver.wps] -Request: getCapabilities service = WPS baseUrl = http://...

I am tracking a device that might loose GPS signal then and there. And when the GPS signal is too low, I should use the accelerometer and Gyroscope sensors data to guess which way they should have gone. I am not doing it in real time. I can store the data and send up for post processing.So all...

I am trying to customize an Albers and a Hotine Oblique Mercator (HOM) projection to minimuze distortion in the region I am analyzing. The region extends from about 51 to 62 degrees latitude, covering an area about the size of the Ukraine. The region is oriented NW - SE. I want to make sure I...

I am using esri network analysis tool and I just want to draw the path between two clicked point on the map (by using route task) I use the example code block in the following link http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#Routing which is included in the ESRI ARCGIS...

I have a file of state 2001 assembly districts outlines, from http://goo.gl/dJPyx in Mapinfo MIF format. I've created a kml file from that using ogr2ogr. These are the outlines of each assembly district. In the kml file each assembly district outline is inside a Placemark tag. I want to put...