3
votes
1answer
6k views

Is there a way to export online ESRI basemap layers to raster?

I have been working on polygonizing the vegetation areas in some counties from imagery. When I have the mosaic raster locally I can easily get the polygons using Image Classification Toolbar. But when ...
2
votes
1answer
68 views

How to choose an area (of mxn metres) within a raster that have values above a certain range

I've got a raster of concentrations of iron on Mars and I want to be able to choose several areas of either m by n dimensions in metres, or just any area in m^2, that encapsulate regions that have ...
2
votes
1answer
232 views

Miller cylindrical projection - central meridian

I'm new to projections topics and I've got a question that may be silly, but I hadn't found answer so far. I'm trying to use Miller's cylindrical projection for converting osm lat/lon to x,y values. ...
6
votes
2answers
7k views

How to make RASTER from irregular point data without interpolation

I was trying to make a raster image from an irregularly spaced point database. The data looks like- > head(s100_ras) x y z 1 267573.9 2633781 213.29545 2 262224.4 2633781 ...
3
votes
1answer
313 views

How to use Collect Values and Tabulate Areas in ModelBuilder?

I have problems with the Tabulate Area tool. The polygons in my shapefile overlap and because of this ArcMap does not calculate proper values. I try to solve this using ModelBuilder where it is ...
2
votes
0answers
328 views

Leaflet wms offset on zoom out

I have Leaflet map with base layer (epsg4326) and wms layer of gps point (also epsg4326). I've noticed when I zoom out , the gps point offset to the left. Any idea why it happens ? Here you can see ...
0
votes
1answer
567 views

Leaflet geoserver wms doesn't show on google map base layer

I have a site running Openlayers (base layer google and overlay wms in epsg4326 from geoserver). The site works fine. I've decided to try doing the same with leaflet , and from some reason I can't ...
1
vote
1answer
156 views

How do make a CSV file visible in QGIS?

I am using QGIS. I have a .csv file containing 3 pieces of information on each row; name, longitude and latitude. I would like to turn each row of the .csv file into a vector point. The file will ...
0
votes
1answer
1k views

What can I do with this unzipped GDB file in QGIS?

I have a zip file that I got from the City department of information technology. Unzipped, it is a directory called DOITT_ZIP_CODE_01_29JUL2009.gdb containing a bunch of .gdbtable and .gdbtablex files....
0
votes
2answers
89 views

Get random point within a multipolygon

Can somebody help me in getting a random point which lies inside multipolygon,i.e I have a multipolygon, then i want to get a random point which lies inside that multipolygon
0
votes
2answers
180 views

How to bring 3D object into 3D application?

I'm doing some GIS as part of my college course and have just started to do some 3D modelling, I'm really a GIS novice, The module is short (only 5 lectures) My lecturer has said that it is possible ...
1
vote
1answer
128 views

Infrastructure networks in GIS modelling

I am currently working on a GIS-based project which aims to model the interdependency of existing infrastructure networks, e.g. transport, oil, pipeline networks, etc. The network interdependency ...
4
votes
1answer
2k views

How to perform a Cost Path analysis in ArcGIS 10.1?

Is it possible to model the easiest pathway through a landscape between many points (rather than just two)? I want to carry out a cost-path analysis, I would like to display the easiest pathways ...
0
votes
3answers
1k views

Unmet dependencies installing QGIS 2.0 on Ubuntu

I have followed the instructions-a link to install QGIS 2.0. Everything worked fine until the punch line, installing QGIS ( I do have Ubuntu 13.10); sudo apt-get install qgis python-qgis qgis-plugin-...
1
vote
1answer
105 views

How to restrict buffer extent within land area only?

I need to create buffer for a point feature, but the buffer area will be restricted within the land area only. For example consider the following: A buffer of say 500 km radius is to be generated ...
0
votes
0answers
125 views

How to calculate specified region area with raster in ArcGIS Engine?

By using the "Image classification" tool we can classify the raster image by "supervised classification",but how to calculate their area? I mean, for example, in regard for a produced class '4', how ...
1
vote
0answers
270 views

How to capture GPS co-ordinates from a Microsoft InfoPath form on a mobile device

We are looking for a way to capture GPS coords through the Microsoft INFOPATH form which is loaded on our Mobile Motion device. Basically, we are trying to put a VB script behind the “Get GPS Coord” ...
1
vote
0answers
137 views

Line defined by two geographical points crossing circle area with defined radius

I'm trying to calculate the amount of lines defined by two geographical points crossing a circle area defined by a center and radius. I've tried to use algorithm discussed here, but in my case it ...
2
votes
1answer
86 views

Isolate the largest patch in a raster in GRASS?

I have a raster with a series of patches (contiguous areas with same value). How do I isolate the largest patch? I know I could run r.stats, look through the long list of calculated areas, figure out ...
2
votes
3answers
767 views

Creating a editable Map with OpenLayers?

My girlfriend is trying to create a webmap using OpenLayers that is similar to this one, which was done in ArcGIS Server. I thought I'd be able to help her as I have GIS and some coding experience but ...
2
votes
2answers
999 views

Doubts about how pgRouting topology is built and how flexible it is

I'm learning pgRouting, to validate if it can be used in a project. I have several doubts. Mostly related with how could I "fill the gap" between the "bricks" it provides and the real world ...
1
vote
1answer
184 views

gdal_rasterize using a “string” as src_datasource

I would like to use a string as src_datasource for gdal_rasterize program. Is it possible to use something like a WKT definition to translate a single point to a raster? Somethink like ...
1
vote
0answers
118 views

Why does GDAL Translate not create any output in batch mode?

Has anyone tried using the Batch Mode function in GDAL translate - qgis2? I can process files individually ok, in my case MODISA HDF files. But the batch mode does not seem to work. Here is my set ...
0
votes
1answer
455 views

Openlayers Custom Renderer - Multiple polygons

I want to render more than one polygon for a feature in a vector layer. So, for example given a polygon render it as normal, then render it again with a different colour and offset by a Y value. I may ...
4
votes
1answer
79 views

Programatically detect the format/version of an arc toolbox (e.g. 10.0,10.1 etc)

Is there a way to tell programatically (from the command line) what format a given ArcMap toolbox was saved in - 10.0, 10.1 and so on?
3
votes
3answers
79 views

Reporting Analysis Steps in ArcMap?

Is there any way to report all the steps I did within a ArcMap 10 project. this could help me to: Make a Metadata description Trackback possible errors afterwards and/or control the analysis Easier ...
0
votes
0answers
62 views

Has anyone else experienced this? Aerials and shapefiles shifted!

I was doing some work with points and moved from one road to another parallel one, when all the sudden my parcel lines were completely shifted as were the points, and roads from the aerial. I re-...
3
votes
2answers
954 views

How to Speed Up ArcGIS 10.1 for Desktop Generating Near Table on Polygon Feature Classes?

I am trying to create a near table to link two datasets. The first consists of the outlines of about 1.8 million buildings, the second a 3 meter buffer around these buildings, which as been merged ...
1
vote
1answer
129 views

Wrong output wth group by and aggregate function in spatialite

I have a grid and for every cell I want to set the column "landuse" according to the largest intersecting polygon. SELECT grid.PKUID, landuse.landuse, MAX(AREA(INTERSECTION(grid.Geometry,...
2
votes
1answer
2k views

How to open InfoTemplate programmatically?

Could somebody help me? How to open InfoTemplate programmatically??? Using of FeatureLayer.selectFeatures(...) not helps. Here is example: http://jsfiddle.net/gfV2K/ When I click on the map then ...
2
votes
1answer
81 views

Mystery duplicate values

I'm using a unique list to populate up to 10 fields for a fc with correct geometry, in an "overloading" manner as you would in excel. I noticed on my first run through I had an "index out of range" ...
1
vote
1answer
74 views

What is the complexity of neigborhood search in PostGIS?

I have a point with coordinates x and y. I want to know all the points in a square around this point, with side L. For this, in postgresql/PostGIS, I use: SELECT * FROM table_of_points WHERE (...
1
vote
1answer
861 views

Get Polygon or IGeometry from Envelope in ArcObjects

I would like to create a Polygon Feature from the geometry of an IEnvelope in C# ArcObjects SDK 10. Is there an easy way how to do it?
2
votes
2answers
3k views

Iterate through multiple Raster files and compute statistics using Zonal Statistics

I have a large number of raster images. What I'd like to do is to compute statistics on different sections of these raster files using a polygon. I think everyone is suggesting Zonal statistics. ...
0
votes
1answer
396 views

How to clip point features by polygon grid?

I am trying to adapt the "Batch clip in ArcGIS 10" script I found on GIS.StackExchange to my needs. I would like to do this in Python as a learning experiment. My data: Point data Standard numbered ...
0
votes
1answer
206 views

Trouble connecting QGIS 2.0 to remote Ubuntu Postgis

I am trying to connect to a remote postgis 2.0 server (Ubuntu) from QGIS 2.0.1 (installed on winxp). I have been working with QGIS 1.7 / 1.8 on the same database for almost a year without any issue. ...
1
vote
0answers
116 views

Color blending/compositing in web mapping frameworks?

The color/layer blending capabilities of QGIS 2 produce marvelous results. Blended rasters are especially nice to look at. Blending is, to me at least, a better way of combining layers than mucking ...
1
vote
3answers
806 views

Cache generation failed. Progress gets stuck at 0%

I'm trying to publish a map service containing a large .tif raster (48GB). I managed to publish a small cached raster successfully (for testing), but when I tried to publish the large one, the cache ...
1
vote
1answer
69 views

Field's name with numbers: why not?

I have tried to create field in TOC called with numbers with python. But, it has a problem: it couldn't do it because name's of fields are numbers. It is strange for me. When I do new field in shape ...
0
votes
0answers
665 views

Date Parameter in model builder - ArcMap

Basically I'm building a model where the user has to select the data from a drop down list and the result is executed. I have a problem when trying to pass a date as a parameter. Below you can find ...
26
votes
2answers
8k views

Proper workflow for LAS to DEM conversion

I regularly come across LiDAR (.LAS) files with elevation data. When I do, I always struggle to find a way of converting them to a DEM for hydrological analysis. I have developed several workflows, ...
1
vote
3answers
318 views

How to Project a point on feature in PyQgis?

In Arcgis IProximityOperator.QueryNearestPoint Method was available to get the nearest point. Similarly Is there any function available in pyQgis? Thanks in Advance.
1
vote
1answer
279 views

Join Tables related by a composite primary key in qgis

I have two tables, one has the geometry and other has attributes. The table with geometry has unique number primary key, and 4 columns admin1,admin2,admin3,featureid. Table two is a csv file has the ...
2
votes
0answers
109 views

Is there a way to build topology and work with topology relations in PyQGIS?

Is there a way to build topology and work with topology relations in PyQGIS? I'm asking because I need to run some custom generalization algorithms on my data, and I need to preserve topology. ...
0
votes
2answers
1k views

set anchor for a PictureMarkerSymbol in arcgis android sdk

I am trying to create a PictureMarkerSymbolin arcgis android, however I found that the marker use the center of the drawable as the anchor point, is it possible to set the anchor? update: This is ...
-1
votes
1answer
56 views

Error after code completion

Why arcpy throwing an error after completed code execution ? import os import arcpy import xlrd arcpy.env.overwriteOutput = True inWS = r'C:\Excel' excelDirectoryName = inWS arcpy.env.workspace = ...
1
vote
1answer
713 views

Adding feature layer to ArcMap from url

Is it possible to somehow load feature layer from REST (like: ArcGIS Example Service) to ArcMap? No need to edit that layer, we just need to select data from it and then create a local FeatureClass.
4
votes
1answer
229 views

Password protecting tables in cartodb

I am trying to find an easy way to have private tables, yet exposing them to certain clients if they are authenticated. This authentication can be achieved by a token system that allows the client to ...
0
votes
3answers
996 views

How to symbolize a layer on multiple fields?

I'm working in ArcGIS 10. I have a layer that contains 8 attributes and each one of these fields can be categorized into 3 sub categories. I need to display them on a single map. Update I ...
2
votes
1answer
706 views

How to mosaic Landsat 7 images correctly?

This is a result of mosaicing of two Landsat 7 images (layer stacked) in TIFF format. I was aming to put these images together with no overlaping visible line between them. The process was: Added ...

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