0
votes
0answers
3 views

how to give pop-up for a point type layer in ms4w

My aim is to create pin point on map and click event on that pins.I am able to generate map with the pins on the exact locations but i don't know how to give pop-up when clicked on the pin.Help me ...
0
votes
0answers
3 views

r.sun delievering unrealistic Values

i need your help. Im trying to calculate the global irridiation for a specific area. im interessted in the results for rooftops in special. I have a DEM, calculated slope, aspect and horizons and ...
0
votes
0answers
5 views

Manipulating the amount of numbers behind the comma while working in R

In RStudio I am transforming data from coordinate system to coordinate system and back. Then I compare the coordinates of the original file with the endfile. This shows minor differences 7 digits ...
1
vote
1answer
8 views

Get a list of property elements using GeoServer

I'm using GeoServer with openlayers and I want to build a filter check-box dynamically, depending on the elements of this column: How can I query GeoServer so that I get a list of the different ...
0
votes
0answers
4 views

High-DPI printing with Esri Javascript API and esri.dijit.Print

I've got cached tiles for all map layers at various zoom levels, and would like to print at DPI higher than the default (around 96) by using tiles from a deeper zoom level. It doesn't matter if map ...
1
vote
0answers
4 views

Preserve polygon boundaries when vectorizing a raster according to a polygon vector

I have a raster which I clip by some polygons and then convert to polygon. I would like to obtain the same number of polygons in both my vector files. The problem is that some areas in the vector ...
1
vote
1answer
12 views

ArcGIS Viewshed without Observer Points

I want to create a viewshed around a LineFeature. The problem is, I have no observer points. I would like to create them with a gap of 10m around the line feature. The LineFeature should be 1m over ...
0
votes
0answers
5 views

Extract elevation data from Landsat / MODIS imagery?

Just curious, have anyone tried to extract elevation data from LANDSAT or MODIS imagery? So far, I came across one journal by Toutin who did so using adjacent LANDSAT 7 imageries. Results seem pretty ...
1
vote
1answer
12 views

QGIS show gdal_polygonized file in EPSG:54004 instead of EPSG:3857

I am polygonizing a TIFF with the gdal_polygonize.py and the resulting Shape is shown in QGIS in the wrong projection - EPSG:54004 instead of EPSG:3857. I have a TIFF in EPSG:3857 and polygonize it ...
0
votes
0answers
9 views

How to query postgres with gis to get GeoJSON for GeoJSON tile layer?

I have a postgres database with one table like the following: CREATE TABLE post_pl ( gid serial NOT NULL, zip character varying(5), zip_n integer, city character varying(50), geom ...
1
vote
0answers
6 views

How to add additional HTTP response headers?

I installed recent MapProxy (1.7.1) on Ubuntu 14.04 LTS following this guide. Everything works - I can get test OSM layer's tiles through proxy. But in order to use this layer on my web page I have to ...
2
votes
1answer
16 views

Calculating distances from points to the centre of cells

I am using QGIS 1.8.0 (using older version because I need the Qmarxan plugin which is not available for 2.4.0). I have a study area that has a vector laying of "planning units", or cells over the top ...
1
vote
0answers
13 views

How to use inbuilt tools in QGIS Modeler?

Is it possible to incorporate inbuilt tools like, for eg: vector grid of Research tools in QGIS model builder ?
1
vote
1answer
9 views

Create a web application with ArcGIS Server

I have a question about ArcGIS server: I want to make an application for users who can search for proper houses, like a house-finding engine, and I published my map to ArcGIS Server but how can I ...
1
vote
0answers
4 views

Restrict the scale of the search widget in ArcGIS Flex API

I wonder if I could restrict the scale scope only for the searching widget (and not the extent of the map)? We want to narrow down the scale for searching in order to avoid too many results which may ...
2
votes
1answer
11 views

label based expression with colour QGIS

I am struggling to alter the label colours according to field values (as strings) in the attributes table. In my mind what I want is: If the string in column X = 'Proposed' Then label the point ...
2
votes
0answers
16 views

How to develop a real-time navigation App using QGIS API?

I want to develop a navigation application based on QGIS using C++, for live tracking. I think it is quite normal for GIS to do such things, especially QGIS as it is a very mature GIS platform. But ...
0
votes
1answer
6 views

ESRI JS API : FeatureLayer : pure client side query?

so I've created this wrapper around feature layer where I create the empty feature layer as is in the API help page : new FeatureLayer(featureCollectionObject, options?) providing the first ...
1
vote
0answers
5 views

Urban Heat Island USING ENVI

I have downloaded MODIS images for a specified area.. Its my first time that I am working on UHI (Urban Heat Island).. I need to know the methods to work on it.. I am using ENVI for this.
1
vote
0answers
14 views

Zonal Statistics - what is the problem?

I tried to solve the following issue by myself but without success. On the one hand I have a raster file which is the result of the processing "shapes to grid" tool. On the other hand I have a ...
0
votes
0answers
8 views

ArcGIS for Server 10.3 and Portal for ArcGIS

I just had a meeting with ESRI distributor and learned that Portal for ArcGIS will not be an extension but be a part of ArcGIS for Server beginning from 10.3. We currently do not have either Server or ...
0
votes
0answers
11 views

Releasing FeatureLayer COM object

I am going through some code and trying to implement correct COM object releasing because currently in an error situation we cannot remove some generated files as the databases are kept locked. I ...
0
votes
0answers
19 views

Arcpy Table To Table Conversion Error

I am running a script that uses an excel spreadsheet to define and output maps, kinda like my own data driven pages set up. The only input into the tool is the path of the spreadsheet. When I run ...
0
votes
0answers
14 views

Creating Pie Chart with radius based on another field?

I have to symbolize my ares polygon feature class and create pie Chart based on the following values in ArcGIS 10.2 for Desktop: Area Tds_Calc Free_Chlorine Ph Fluoride Turbidity ...
2
votes
1answer
45 views

Is it possible to create a data frame graphic using arcpy?

I'm interacting with an MXD using arcpy, and wish to create a graphic within a data frame - as with the Draw toolbar when working manually. The GraphicElement page says... The GraphicElement ...
1
vote
0answers
11 views

What are definitions of watershed segmentation, local maxima, variable window search, etc (about Lidar for vegetation)?

I am not familiar about Lidar. I want to measure trees height and number of trees. I guess, watershed = to locate the trees, local maxima = to measure trees height. I used these methods in SAGA GIS. ...
1
vote
1answer
28 views

Postgres Performance with Radius Searches

Im porting an application from mysql to postgres, and have several tables with 500k+ rows in each of geo points (lat, lon). In mysql i used a bounding box query with haversine to select rows within a ...
1
vote
1answer
13 views

Use Display Expression for KML Popup, SHP to KML ArcGIS

In Arcmap I've created a complex label expression in the Display expression for my layer. I'd like to have that expression displayed when I convert the layer to .kmz file for display in Google Earth. ...
1
vote
0answers
25 views

Clipping rasters in QGIS

I'm having some problems with clipping rasters. I started clipping my raster using extents, but I saw that the clipped raster is different from the original raster. I created a virtual raster to use ...
1
vote
0answers
15 views

How to draw WMS layer with Attribute-Based Dynamic SLD to HTML Canvas?

I'm working on an app using geoserver and openlayers 2.13.1. I have several wms layers and I need to export whatever in my openlayers map div as an image. After researching, I found this blog: ...
1
vote
0answers
12 views

How to calculate distance from point to polygon with a time frame?

Using the Near tool, I knew that I can just calculate the distance of each house to the nearest fire. However, I only want to keep fires that happened in the past 7 years for each house. For example, ...
0
votes
0answers
24 views

Routing and Validating trip mileage with open source software

I am looking for ways to validate mileage charged by our contractors. They are paid from a central location to a customer, and then from the customer to a drop off location. I use QGIS for a bunch ...
0
votes
1answer
42 views

Cannot load postgis layer from sql string in pyqgis

I'm trying to load a layer using the following code in qgis python console: sql = "(select the_geom, ID from mytable)" uri = QgsDataSourceURI() ...
0
votes
1answer
18 views

Create a named map in CartoDB

I'm trying to create a template map following this tutorial from the cartoDB's maps API. My template.json file { version: "0.0.1", name: "template_1", auth: { method: "open" }, ...
1
vote
1answer
85 views

How to extract elevation information from contour lines?

I'm working with OS windows 7 and using ArcGIS 10.2 and I have a point shape, which I must extract elevation for every point in it but the only useful data is a contour line shape. Not sure if it's ...
5
votes
1answer
27 views

Spatial+Temporal database request for 4D intersection

Here is the function I need to implement. My application deals with mobile objects with variable position and range (think of radar range). As I can't test each minute if n mobiles detect each other ...
0
votes
0answers
3 views

How can I extract variable information from an OpenLayers 3 object?

I have tried to make a simple map with OL 3's Geolocation module. I succeeded with a resource wasting method. There must be a simpler way to extract variable information from an OpenLayers 3 object. ...
1
vote
0answers
5 views

Geoserver + MongoDB: connection OK but layers list empty

I setted up Geoserver (ver. 2.5.2) with the MongoDB plugin (ver. 11.2 - http://repo.opengeo.org/org/geotools/gt-mongodb/11.2/). The connection between Geoserver and MongoDB is OK and when I create a ...
0
votes
1answer
29 views

Gdal: How to reproject from equirectangular to mercator?

I work with raster ETOPO1, made a crop of my area of interest. curl -L -C - ...
1
vote
1answer
44 views

Hardware requirements for a modern GIS workstation [duplicate]

I need an advice on what hardware configuration would be most efficient for a modern GIS professional. Should I go for out-of-the-box HP/DELL workstations or should I assemble different parts? Note: ...
1
vote
2answers
28 views

How can you create a depth raster from a DTM and a polygon in QGIS?

I have a DTM raster and a flood outline in polygon format - how do I create a depth raster for the flood outline (i.e. flood level minus DTM level)?
0
votes
0answers
10 views

Can I tie-in a data collection form with an online map service to crowdsource values for map features?

Apologies if this has been covered before. I've done some research but unfortunately my Google Fu has failed me. I want to be able to collect some simple numeric data from multiple people over the ...
0
votes
0answers
20 views

What does property FeatureTypeName do in Styled Layer Descriptor (SLD) specification?

I am studying the Styled Layer Descriptor (SLD) specification. I got a general grasp of how I can use it to style a map. I still have one question about the FeatureTypeStyle though. When looking at ...
0
votes
0answers
15 views

How to reference a number variable in r.mapcalc within QGIS graphical modeler

I need to run the following formula in r.mapcalc: (xor(abs(A-B),abs(A-C))>120)*A I would like to however use a user defined number input variable instead of the 120. I already have this variable ...
2
votes
1answer
26 views

In QGIS, is it possible to save graduated styles to use on different columns?

I'm using QGIS to produce thematic maps of 9 quantities (given in 9 columns in the attribute table) which have values broadly within the same range and I would like to plot them using the same ...
1
vote
1answer
16 views

Preserve attribute table while using extract by mask in arcgis

On using the Extract by mask function on a raster with several columns (beyond value and count) in the attribute table, the resulting raster does not have all the columns (it only has value and ...
1
vote
2answers
28 views

how to calculate area verses each NDVI value?

I created an NDVI map, I want to calculate area of vegetation verses the respective NDVI value of the given map. Which tools are used for this process and what steps are required?
1
vote
1answer
19 views

hiding some “feature”s in GeoJSON file on map

I have geojson file including boundaries of most countries in world. When I clicked on a "feature" (aka country, or polygon) I want to hide it while keep showing the others. because I am planing to ...
1
vote
0answers
14 views

Geoserver Realm

I am trying a lot of days to create a GIS app with Geoext, openlayers and geoserver through Apache! Well I achieved that but I had created many users with different roles! When I am loading my app ...
3
votes
0answers
23 views

Temporary File GDB-based scratch workspace is not deleted after it is released

I have created a temporary File GDB-based scratch workspace as follows: var factoryType = Type.GetTypeFromProgID("esriDataSourcesGDB.FileGDBScratchWorkspaceFactory"); var factory = ...

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