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This is the scenario: Using ArcMap I have a feature that has several attributeseach attribute has a set of domains that can define each field. I also have a table that has data and is related to each feature through a relationship class. The values in the table also are defined from a set of...

since days i've been hustling around trying to figure out, how to properly query data from a PostGIS database using geoalchemy2, an extension to python's sqlalchemy supporting spatial database operations. I'm working with python3.4 and Openstreetmaps data from Brandenburg (admin area within...

I have a process that has lots of items. This for some reason seems to make a difference to the time it takes to drop a column from a shape file during a model run. i need to drop MANY columns.QGIS spends a long time on the 1st, the same time on the 2nd, then the 3rd....Is there any way to...

Im trying to cut donut polygons ready to go into a system that cant display them. Basically the exact opposite of this post: How to convert fake donut holes in polygons to real ones? I want to cut at any point so that the polygon no longer contains an inner ring(s). (ideally the shortest path...

I have a select query (really long) based on which I want to create a layer on google maps. I tried the same query in cartodbo map editor(online) it worked fine. But when I wrote a code to access the same data via javascript its failing with the error...

Im reading about the GetLegendGraphic and it seems to me that I can pass a FEATURETYPE parameter to tell which feature types I want to create the legend for. But when I use it like this...

I can open and read a hyperspectral image using GDAL according to the instructions brought by Max K أكثر...

I'd like to plot the distribution of a species on a map of Switzerland, following this tutorial. library(maps)library(mapdata)map('worldHires', 'Switzerland', xlim=c(5, 12), ylim=c(45,48))From this website I download the shapefile for e.g. Pinus sylvestris psylvestris psylvestrisclass ...

I have an ESRI TiledMapService layer and I have attached an event handler to the TileLoaded. Given the level, row, and column, how can I get the envelop of the tile in map coordinates? I'm using the ESRI Silverlight API... What I am trying to do: I have a polygon (in the same coordinates of...

I have prepared a basemap in Mapbox which includes imported data (basically, marker points). I was expecting these markers to show when using that project as a basemap in CartoDB, but it only shows the basic tiles. Is anyone aware of this issue or how I could go about including the markers from...

GPS satellites send 50 BPS of info apart from 1MBPS PRN. What is the basis for choosing 50 BPS. Why can it not be 100 or 1500? The reason I am asking this is Almanac download time is 12.5 mins which is quite long. أكثر...

I have a project that involves designing custom forms for GIS data collection using the mobile mappers. I am aware of the capabilities of arcpad but i would like to know if there are any open source solutions. أكثر...

How to find the distance from the centroid of each subwatersheds to the main outlet of a catchement. أكثر...

I have a DEM of a study region; I want to modify the DEM in order to reflect the coastline outlook when the sea level was 5 meters higher than today. What I have done so far is to use 'Raster Calculator' with the quite simple following formula: DEM >= 5. Then, in the returned raster, I have set...

I'm very new to GIS and I have spent the last few days trying to find some kind of database with the aforementioned polygons with no luck. The purpose is simply to label a location at district level given its longitude and latitude. I tried reverse geocoding but very quickly exceeded my...

My problem: An Arc GIS Schematics diagram export with versioned oracle/sde GIS features can't be reconnected to GIS data on another oracle/sde instance. I'm working on a project where in the first phase we created a railroad network stored in ESRI SDE 10.2.0 in Oracle.This network we exported...

how can i read a version within python. for example lets say I set up a workspace which points to a .SDE file connection. Now how can I read the features from a version within python? I have looked online but cant find anything. Ideally if there is a code that looks for the version that is...

Im a geomatics student. For the treatment I would like to make, I use the gdal executable in QGIS file, with a DOS command. I have a csv file like this (test.csv) : X Y-5.48 42.81-4.78 42.52-5.06 42.02This coordinates are GCP. I would like to convert my csv file in a VRT. On...

I use Leaflet to display some map.I would like the user to be able to resize the map by dragging its borders as she likes.I would like to do this without additional Javascript libraries, instead by using the CSS resize property: https://developer.mozilla.org/en/docs/Web/CSS/resize . For this, I...

I have some GEOJSON-Layers in my QGIS-project. The problem is, that when I zoom in or out, it takes very long to built up the window again. That's because it always loads it from the server. But I don't need that. It's enough, just to load it when I start the project and the handle it like a...