3
votes
1answer
252 views

How to compute average slope and area-weighted average slope?

I am learning GIS for use in hydrologic analysis. Related to computation of overland flow there are two types of slope that I would like to be able to obtain from GIS. The first is average slope for ...
0
votes
0answers
6 views

GeoExplorer Querying Tool

Are there any way to add more query options in GeoExplorer? Becuase the query options available are only limited to "=", "<>", "<", ">", "<=", ">=", "like" and "between".
1
vote
0answers
18 views

Why do pixel (cell) values change for 32 real NDVI values when taking from Multispec to QGIS? [on hold]

Landsat 5 values change from normal NDVI -1 to 1 when created in Multispec as a 32 bit signed data image. When adding the raster layer in QGIS, the value range changed to 0-255. How does one ...
0
votes
1answer
16 views

Adding Virgin Islands and Puerto Rico to CartoDB?

I am new to Cartodb. I have started with the ne_50m_admin_1_states data. How can I add Virgin Islands and Puerto Rico? Is there geometry I can get? Is there an easy way to add them?
3
votes
1answer
385 views

GDAL minidriver and Tilecache

I'm trying to use GDAL minidriver to read tiles folders generated from Tilecache seeding. I have set this in my GDAL source <ServerUrl>http://myserver.com/test/${z}/${x}/${y}</ServerUrl>, ...
1
vote
0answers
7 views

Unable to load DLL 'ArcGISVersion.dll': The specified module could not be found. (Exception from HRESULT: 0x8007007E)

I recently migrated my desktop from ArcGIS 10.1 to 10.3.1 and visual studio from 2010 to 2013. I am now getting a problem trying to run an Engine application. It builds fine but when I try to debug it ...
0
votes
0answers
9 views

Calculating grid to ground correction angle manually [on hold]

I've been running into problems at work with calculating a correction angle manually. The coworker that has been training me in ArcInfo 8 showed me a formula that I have yet to get to get to work - ...
0
votes
3answers
5k views

Why won't QGIS recognize my GPS?

Garmin BaseCamp recognizes and receives data from my GPSmap 60CSx, but QGIS GPS Tools plugin does not. Am I missing a step? I want to be able to transfer data both directions. MacOS 10.6.8 QGIS ...
2
votes
2answers
789 views

Clip_management to raster extent outputs larger raster than raster extent

Using Python and ArcMap 10.0 SP5, I'm trying to reproject and clip a large input raster to exactly the same grid as a smaller target raster (same extent, pixel sizes and projection). The problem is ...
2
votes
1answer
50 views

How can I conduct dimension reduction using Geographically Weighted Principal Component Analysis?

I want to know how to compute the importance of components for geographically-weighted-principal-component-analysis(gwpca)? That is, I want to reduce dimension according to cumulative proportion of ...
2
votes
2answers
21 views

Calculate distance with JTS

I'm trying to get the distance between two points with JTS. The problem is that this function with JTS new Coordinate(Lon1,Lat1).distance(new Coordinate(Lon2,Lat2)) Is giving a different result ...
4
votes
2answers
69 views

How to run qgis scripts in parallel across remote server(s)

I have a stand alone python script using qgis that I wrote with the help of the SE question here The script takes three arguments being; an input file path, an output file path, and another input ...
1
vote
1answer
321 views

Using sql SELECT DISTINCT in Fusion Tables API

How do I go about using sql SELECT DISTINCT in fusion tables API?
0
votes
1answer
33 views

GDAL Python and postgis raster?

I'd like to create a postgis raster using GDAL and python. I can get the driver easily: drv = gdal.GetDriverByName("PostGISRaster") But how can I create a new raster table? I can't find any ...
4
votes
1answer
36 views

How do I count the number of vector lines that pass though a given raster cell?

I am working on a project (currently in GRASS7 though I'm not against exporting to Arc or R or other software if necessary) where I am generating thousands of shortest cost paths (using the r.walk and ...
-1
votes
0answers
13 views

Adding a user to a database - multipart question [on hold]

I added a user to my database via the 'Add User tool' in ArcCatalog, however when i do that user now has privileges to create feature data sets / feature classes in the database. i would prefer that ...
3
votes
2answers
2k views

Getting values from attribute table and inserting another table using ArcPy?

I have line feature class of a river network and “FromTo” table. Lines are dissolved so they are not segmented from junctions. I need to write a Python script in ArcGIS to do following: Begin from ...
1
vote
1answer
188 views

fill a layer's attribute table from another layer's attribute table

i am working on arcgis 10.1. I have a layer of polygons divided into squares of 200m/40m with the attribute table filled. I have a second layer of polygons divided into squares of 200m/60m with an ...
1
vote
1answer
15 views

TypeError raster object is not iterable when trying to normalize DEM

In ArcGIS 10.1 I'm trying to normalize a section of a DEM (digital elevation model) from original values to values ranging from 0 to 100. First I clipped the raster DEM with an irregulary shaped ...
1
vote
2answers
77 views

Read XML file in FME

I want the below xml file to be read by fme. How this can be done? I tried reading documents and seeing videos. This xml looks more complicated. Any help would be appreciated. ...
-1
votes
2answers
18 views

SyntaxError with cursor and Feature Selection in ArcPy?

I tried to select each feature in the layer "temp" and use the selected feature to select features in the other layer "Railway" based on location and then do some calculations with the "Railway" layer ...
1
vote
1answer
248 views

How to link 2 different images in eCognition

I'd like to link 2 different images in eCognition to find the same pixels on both images. The images have same projection (geog lat/long). How can I do this? Thank you so much
0
votes
0answers
9 views

How do I configure QGIS Web Client on Ubuntu/Debian for remote access

I am having issues with accessing the QGIS Web Client on a remote web browser despite getting a working GetCapabilities request. I have been able to install QGIS Server and QGIS Web Client on the ...
1
vote
0answers
44 views

Unable to stylize as pseudocolor render type

In a raster layer's Style Properties, I can choose pseudocolor render type, and choose a color ramp and classify the raster. However, when I click the 'Apply' button, or click 'OK', the ...
0
votes
0answers
8 views

How to calculate the 3D length of line segment in QGIS?

I've been looking through all of the GRASS commands in the QGIS 2.10 processing toolbox and it seems like one of these must be able to do this but I haven't found one yet. There is 'v.sample' which ...
0
votes
0answers
11 views

Using Join with a Raster File

I would like to add a new field to a raster file. Then, I would like to add the new field content. Can I do this with a join of attributes? I know that a raster file can be reclassed. But there ...
0
votes
0answers
15 views

Building Large Network Datasets from OpenStreetMap in ArcGIS?

I'm trying to build a large network dataset from OSM data in ArcGIS. Doing it all at once is taking a long time and seems like there is a big opportunity for it to fail at some point which would ...
1
vote
1answer
375 views

How to import .csv file to CartoDB using SQL?

How to import .csv file to CartoDB using SQL, the data given below : POINT | TOP_dm | BOTTOM_dm | X_RD | Y_RD 35AP7600 | 4418 | 4368 | 262053 | 467223 35AP7601 | ...
0
votes
0answers
6 views

unsupervised classification in qgis (Orfeo toolbox)

I want to run an unsupervised classification of two landsat images in qgis. Therefor I want to compute a kMeans and a SOM (self organizing maps classification). Unfortunately it doesnt work. I tried ...
0
votes
1answer
30 views

Cutting Fishnet OR Create Parcels in ArcGIS for Desktop?

what I need to do is the following task in ArcGIS (10.2): I downloaded shapefiles of different countries. For one of these countries, e.g. Austria, I need to define, eg. 400 squares, which means that ...
0
votes
2answers
21 views

Are there any tools for creating GTFS?

I was asked to create a feed for a company. Are there any tools I can use or do I have to make the entries one by one,line by line? What are the tools big agencies use?
-1
votes
0answers
9 views

Selecting by dropdown menu and zoom in OpenLayers? [on hold]

Using Openlayers and geojson files.....Is it possible to select a feature from a dropdown menu populated feature attribute and zoom to its extent?
0
votes
0answers
11 views

Converting representation geometry override to geometry using ArcGIS for Desktop?

I have a feature class with a representation which is stored as an override. Would it be possible to generate a feature class out of it that has geometry of the representation (not original underlying ...
6
votes
1answer
173 views

How to create an Atlas based on point attributes?

Essentially I am wanting to produce an atlas based on a categorical field in a point layer. i.e. I have a point layer of childcare providers with the categorical field "Provision". I've categorized ...
0
votes
1answer
19 views

Pragmatic Best Placement of Points within Polygon

I am looking to plot the ideal placement of police vehicles within a specific precinct (polygon). Rather than placing them myself, calculating a buffer of travel time (e.g. within 3 minutes), and ...
3
votes
3answers
99 views

Displaying single label for multiple features with same value in ArcMap?

I'm working on ArcMap 10. I have a layer of points which I categorized based on a field that we can call "Name". Thus, as you can see in the picture below, the layer is now composed of 24 colors, each ...
1
vote
1answer
12 views

Multiple CON Expression in ArcGIS Raster Calculator

How can I write the following conditional statement with CON? If ((VALUE = 20 OR IF VALUE=24) then assign value 0, else 1) Con(("Raster1", 0, 1, "VALUE =20")|("Raster1", 0, 1, "VALUE =24"),0,1) I ...
1
vote
0answers
9 views

Creating map or converting to GeoTIFF, Bufr format?

I'm trying to work with spatial data saved in WMO BUFR format (.buf extension). I need to cut data to my extent, create map and calculate spatial statistics. I'm aware that two tools are able to open ...
0
votes
1answer
30 views

Adding a group layer to another group layer in an Mxd using python

I would like to take an empty group layer and add it an existing group layer within an MXD. The empty group layer does not currently exist , i am going to use an empty group layer i have saved within ...
0
votes
0answers
8 views

NLCD data-dividing it into counties so they can be compared

I have a state wide NLCD raster data set. I would like it to be separated into counties, so I can use something like Zonal stats for each county to make calculations and compare counties. This would ...
0
votes
0answers
19 views

Create Random point generator tools [on hold]

I am looking for a tool that has similar to Create Random point generator that provide more tools ? I am aware that ArcGIS 10.2.2 has one on their arctoolbox, but I wanted to know if there are more ...
0
votes
0answers
12 views

Gravity/Huff model tools in QGIS without rasterlang plugin?

As the person of this question: Gravity/Huff model tools I am looking for a tool to simulate a gravity model using a point-based layer. As in the case there, my points have a z-value and the higher ...
1
vote
1answer
892 views

Using a Select By Location in Python and Calculating a field based on what State Plane a point falls in

Here's what I have so far. Do I need to make another feature layer based on the selection? import arcpy arcpy.MakeFeatureLayer_management(r"PATH TO THE POINT", "point_lyr") ...
0
votes
0answers
6 views

In Geotools, why does reprojecting the origin of a GridGeometry2D results in off-the-grid coordinates?

I have a simple GridGeometry2D in Geotools 13.1 that is created like this: GridEnvelope grid = new GridEnvelope2D(0, 0, 100, 100); Envelope2D envelope = new Envelope2D(CRS.decode("EPSG:3857"), 10.0, ...
42
votes
3answers
53k views

Algorithm for offsetting a latitude/longitude by some amount of meters

I'm looking for an algorithm which when given a latitude and longitude pair and a vector translation in meters in Cartesian coordinates (x,y) would give me a new coordinate. Sort of like a reverse ...
2
votes
0answers
12 views

GeoServer and PostgreSQL JSON column

I have a database table with a dynamic schema implemented via a JSON column named "properties". Currently GeoServer doesn't recognize my JSON column. Is there some way to make Geoserver recognize ...
5
votes
2answers
139 views

Is adding a new table for every layer a good design idea?

Is it a good design idea to maintain separate tables for each layer in a PostGIS database?. Every layer is defined by users. A user creates his/her layer say ATM location. Thats meant by defined by ...
8
votes
3answers
818 views

What are the Pros and Cons of hstore data type in postgis?

PostgreSQL has a module named hstore that implement the use of key/value pairs (it's something like the OpenStreetMap model, but in a single table). What are the Pros and Cons of hstore regarding GIS ...
0
votes
1answer
156 views

WPS Client implementation in our desktop

How to implement wps client in our system and also specify requirements needed? How to specify the proxy to the OpenLayers.ProxyHost = 'proxy.cgi?url='; var map, client, intersect, buffer; ...
0
votes
0answers
36 views

Database connection fails when using db authentication, succeeds using OS

When i attempt to make a connection to a database on my SQL Server 2014 sever via Database connections in ArcCatalog using with db authentication i get the lovely "Connection was attempted with an ...

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