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I have a geology layer with a very large legend that was painstakingly created based on a geological code. I now have a new attribute which is a friendly description for each code and I would like the legend to use (or simply display) the description instead of the geological code. How can I...

I've collected a bunch of GPS polylines (WGS84). What is the easiest way to measure the length of these lines in KM using QGIS or ArcGIS Desktop? أكثر...

I need to add a widget in Configurable Map Viewer (CMV), which will return me the nearest facility of parcel number entered in the box. Which is to be done by Network Analyst in ArcMap and i have created that layer.Here is the code, which actually return me the nearest facility when i click a...

I calculate sequential values in field [ORDER_ID] What need change in script to calculate sequential values based on group field [GROUP_ID]. I select values manually and use autoincrement () in Field Calculator. Parser: Python Expression: autoIncrement()Pre-Logic Script Code: rec=0def...

I have an image with known boundary and projection EPSG:4326 and want to overlay it to map using Leaflet.js. I found that Openlayer have function "transform" which can change projection easily. Is there any simple way to transform image from EPSG:4326 to EPSG:3857? Thank you so much...

I have two fields that shows areas of two land tenures on the same attribute table. My aim is to see whether they match or not. If they do match, that means both areas are correct, if not, then i need to refer to the survey plan. Is there a tool that i could use that will select all areas that...

I think this should be a relatively simple process, but I'm not quite sure how to approach it. I have a shapefile containing 1000's of polygons. I also have 19 rasters. All of the polygons fall withing the extent of the rasters. The rasters are equal in extent and resolution. Previously I have...

I need to convert GPS coordinates to EPSG:54004 on android. Are there any libraries or formulas to acomplish the task? Thanks in advance. أكثر...

I am trying to estimate hydraulic head using SRTM DEM. My objective is to calculate hydropower potential using the hydraulic head and inflow among others. The problem is I do have estimate of head. How can I do this? I am using ArcGIS 10. أكثر...

Is there any way to obtain the OBJECTID value from returned result from GISServer query? For example: var searchString = "OBJECTID = 0001 OR OBJECTID = 0002";var queryTask = new esri.tasks.QueryTask(url);var queryParams = new esri.tasks.Query();queryParams.outSpatialReference = new...

I am trying to insert into my database using the code below however I am having no luck. There is one post relating to what I am trying to do here However he has had no replys and the code that works for him does not work in my case. Here is what I have so far. otherlat = '51.69842'otherlng =...

I'm starting to learn D3 and it seems like a powerful framework. I'm trying load the data from json. I can see data but nothing happen after loading data into D3 library. There are no error messages in the JavaScript console. Here's my code: Map Plunker ...

I'm trying to understand the itemChanged signal to be able to update some information. An example of what I'm trying to achieve could be: def setCoordText(): label1.setText(str(label1.x()) + "," + str(label1.y())) label1.itemChanged.connect(setCoordText) so that when the label is moved to...

I am working on a program to export data from a view containing a geometry type in Sql Server 2008, to an ArcSDE table on another server which also stores data using the geometry type. The source database is not running ArcSDE. This will be a nightly job. Following the documentation at the...

I have created a topology graph of a polygon feature and I want to find the individual FIDS of the lines of the polygon. I want to construct an adjacency matrix to create the shortest path. How can I do this with ArcObjects programming with VBA? أكثر...

Levels of the air pollutant have dropped by about 80 percent over the eastern United States. أكثر...

I am working with GPS tracks (lat/lon values) and my goal is to compute the minimum bounding box for a small geospatial library I am working on. The datasets are not huge, maybe a couple of tens of thousands of points. I could not find an algorithm that deals with tracks/datasets crossing from...

I'm attempting to find the nearest distance between a set of points, and a set of polygons. I don't want to use near tables because I have to do this operation for a large number of different selections on my polygon file, and I don't want to generate that many tables - all I need is a number...

I need to do some raster/vector processing on some non-overlapping tiles. My python script needs to find the correct tiles and then extract the raster values and count them up. My script needs to be flexible enough such that sometimes there are no tiles to process while othertimes there could...

I am running the Calculate Field GP tool from the arcpy in ArcMap. When a row value is updated, it does not show up untill I use the Reload Cache tool (Table Options > Reload Cache). How do I refresh the attribute table automatically without using ArcObjects? I have tried updating the...