5
votes
0answers
378 views

Plugin Workspace: when to close an OleDbDataReader?

I'm developing a plugin workspace for ArcGIS. Internally, the plugin uses an OleDBconnection. All of the sample code I see seems to stress the importance of closing and disposing the connection. ...
5
votes
0answers
138 views

Why doesn't Polygonizer copy the line ids to my polygonized shapefile?

I am trying to convert a line shapefile into a polygon shapefile using Polygonizer plugin, and when my new polygons are created all the cells in my id field are "Null", although I have clicked "copy ...
5
votes
0answers
184 views

Advanced GMaps directions

I try to create an application for taxis. The application will be GMap based. On the map will be marked the region in which the taxi driver is working in. The region will be a polygon designed by ...
5
votes
0answers
794 views

Evaluating map projection scale error

This is related to a previous question I posted. I am trying to quantitatively evaluate scale distortion associated with choosing different projection center, center azimuth, and scale factor values ...
5
votes
0answers
353 views

convex hull over selected features

I am trying to achieve a convex hull over a feature Set returned by a query. But have been facing the error below which i am not able to figure out In order to debug to see how the convex hull works ...
5
votes
0answers
387 views

How to convert a set of points to a solid object?

I have a data generated as the output of some numerical processes. I need them to be converted into 3D solid objects (as CAD solid format) to make them importable for some particular numerical ...
5
votes
0answers
869 views

How to find layer ID and name from Identify query using ArcGIS Web ADF?

I need to retrieve the layer ID of every layer returned by the IQueryFunctionality.Identify function (I am using ADF with .NET) Identify function spits out a DataTable array for layers which have ...
5
votes
0answers
800 views

How to use Route Task in Network analysis tools

I am using esri network analysis tool and I just want to draw the path between two clicked point on the map (by using route task) I use the example code block in the following link http://help....
4
votes
0answers
23 views

How to undo field calculation in ArcGIS Pro

I am using ArcGIS Pro and cannot find a way to undo field calculations. With ArcGIS, field calculations could be undone when an edit session was active, but Pro seems to be in a perpetual edit ...
4
votes
0answers
30 views

Customizing ISO 19139 metadata profile in ArcCatalog?

I'm using the ISO 19115/19139 metadata standard, and I need to convert some optional elements into mandatory elements. Is it possible to achieve this using ArcCatalog as the metadata editor? About ...
4
votes
0answers
84 views

Raster calculator creates strange output

I am trying to combine two raster layers (one is nighttime satellite data, the other is the GPW population density data). I am using raster calculator to combine the two (the following is for a ...
4
votes
0answers
46 views

Using QGIS for current SAR (Search And Rescue) operation?

A friend of mine, Christiaan Wilson is missing since 15 may during descending the Dhaulagiri mountain in the Himalayas. One searching team has already finished one operation. A second is on the way. ...
4
votes
0answers
154 views

How to generate surfaces of different heights from LIDAR points

I am seeking a way to generate surfaces (polygons in a 3D space) of different heights from LIDAR point clouds, whose spacing is 4 points per square meter. The typical application is like roofs, which ...
4
votes
0answers
51 views

How do I load 1 billion points into PostGIS?

I have a file geodatabase containing research data that I need to load into PostGIS. The GDB contains one feature class with one billion records with three columns (the FID, a FK, and the geometry (...
4
votes
0answers
29 views

Using QgsNewVectorLayerDialog

I am using QgsNewVectorLayerDialog for taking user input for creating a new shape file. When the user clicks OK i am reading the inputs selected by the user using the following code. dlg = ...
4
votes
0answers
44 views

How to prevent automatically redraw the graphic layers on ArcObjects?

After a Shape File that was read to IFeatureLayer converted to IGraphicElements, I'm trying to draw that on map (using Sublayer of ICompositeGraphicsLayer). Of course, I succeed to display it on map, ...
4
votes
0answers
65 views

Connect data from two different layers

I'm trying to connect data from two different layers to combine them in one new layer and continue working with them. Let me explain that a bit more detailed: The first layer contains data (and ...
4
votes
0answers
124 views

I can't create/save changes in shape files on QGIS

I can't create or edit shapes in QGIS, the files are created on my system but cannot "fill" it with the features. I'm using QGIS 2.14.2 64bit Windows 7 This is the error i get when trying to save a ...
4
votes
0answers
104 views

Error after successful ArcGIS PrintTask

Using ArcGIS Javsacript API on one server to grab a PDF from a custom print service published on a different server. We have used the exact same script successfully on other apps/servers before with ...
4
votes
0answers
31 views

Symbolize a layer based on it's related table (1:M relationship class)

I have a layer of polygons joined by a relationship class to a table by Field = DistrictIDNumber The Table has multiple entries for each polygon so it is a one to many relationship. Is there any way ...
4
votes
0answers
35 views

Animate panning map in QGIS?

I want to create a short video illustrating the route of a proposed road by starting the map in one position, then panning to a number of other points. Is this possible in QGIS using the time manager ...
4
votes
0answers
29 views

Calculating distances (differences?) between two regions?

I am building a machine learning system which predicts the location of tweets as a bounding box (using the google maps API among other things). Since the twitter API also supplies a bounding box, I am ...
4
votes
0answers
26 views

How can I get a numerical (or value) display for equal intervals in a layer?

I'm looking to classify regions on a map by the amount of light pollution in the area. I have the varied intensities (0 through 60) plotted using a color map, but is there anyway that instead of a ...
4
votes
0answers
52 views

Some characters in OpenStreetMap display as rectangles

I installed tileserver based on the instructions provided here for Ubuntu 14.04 using this approach . All fonts and Shapefiles were downloaded and installed from INSTALL.md. The tileserver works ...
4
votes
0answers
54 views

Geoprocessing Service crash while executing

I have created a geoprocessing service, which can print a webmap(JSON) to a PDF or PNG. The ArcGis for Server and ArcGis for Desktop are running on my workstation. The Website, which host my webmap ...
4
votes
0answers
54 views

Issues updating field values programmatically for particular field data type on 64bit Windows computer using QGIS 2.8.7

I have an issue with a plugin for QGIS 2.8 I'm developing when using it on a Windows 64bit machine (as opposed to 32bit). I am trying to update values in a particular field in my plugin, and the ...
4
votes
0answers
46 views

How to get NIR values into a LAS file then a CSV?

We are trying to deliver a LAS file with NIR values added for each point. The NIR comes from a raster captured at the same moment as the LiDAR, and is stored as an 8bit number along with RGB in 8bit. ...
4
votes
0answers
52 views

Using one to many join to *.xlsx in ArcGIS Desktop?

I'm working with ArcMap 10 and have some trouble joining a shapefile and a .xlsx file. The .xlsx contains sensor data (CO2, NO2 etc.) without location information. The shapefile contains all the ...
4
votes
0answers
24 views

Is there a way to use the GDAL C++ API to find areas of overlap between two SAR images?

I have a bunch of SAR images (about 1 GB each) on which i need to do some image processing. Each image is georeferenced and there is significant overlap between each pair of images in the set ie. one ...
4
votes
0answers
38 views

Are there any MSSQL Licencing restrictions regarding ArcGIS Server Services

I use ArcGIS Server in conjuction with MSSQL Server 2012. According to my Database Administrator there could be licencing restrictions on the side of MSSQL when publishing Data over the web with ...
4
votes
0answers
92 views

Import Vector data to QGIS from pdf and apply georeference

I am Using QGIS 2.14. I have a pdf created by Mapinfo, it contains multiple layers of vector data that I can open as separate vector layers in qgis. However no map projection data was saved to the pdf....
4
votes
0answers
39 views

Ice type differentiation using satellite data

I would like to classify glacial area by categories of snow (if there is) and ice, but what's most important: between old ice and fresh ice. They have different properties that are possible to ...
4
votes
0answers
71 views

Cell Statistics standard deviation values incorrect

I'm having some issues with the Cell Statistics tool in a python script I am writing. I am using 30 years worth of global cumulative annual rainfall data as input and am getting strange values in some ...
4
votes
0answers
91 views

Which statistical methods to compare the spatial distribution of two different variables in two raster maps?

I am working with two global raster maps using the R Software (original file: netCDF for map 1 and GeoTIFF for map 2), with a resolution of 5 min of arc. Map 1 contains data on the share of the land ...
4
votes
0answers
41 views

QGIS canvas: I cannot remove blue “nested” grid/rectangles in canvas (BTW what is it?)

A blue "nested" grid suddenly appeared in the canvas (see image below). I don't know what I did to make this happen and how to get rid of it. Can anyone please advise me on how to remove this?
4
votes
0answers
30 views

Qgis Python - Legends in Horizontal

I have successfully added legends in Map using Qgis QgsComposerLegend () python programming .(using Qgis python console) but legends are added vertically.I wanted to place legend horizontally. If you ...
4
votes
0answers
50 views

How to reproject MODIS L2 data with lat/lon

I downloaded the MODIS level 2 data for precipitable water vapor (MOD05_L2.A2015193.1535.006.2015194020321.hdf) and the corresponding geolocation file (MOD03.A2015193.1535.006.2015193213734.hdf). When ...
4
votes
0answers
27 views

Parallel feature request connection limit

I have a large pool of feature requests that need to be performed on a PostgreSQL layer. Please assume that these requests cannot be joined into larger requests. If I spawn several threads to perform ...
4
votes
0answers
51 views

TypeError: QgsEncodingFileDialog

I am using the latest version of QGIS (Lyon) on MAC and have set the default Python version 2.7. Moreover, I have installed all the required python modules and GDAL. It was working before, but now, ...
4
votes
0answers
37 views

Is it possible to have a locked TOC in QGIS

I would like to customize QGIS for a custom use case where the user will work with a very simple customized UI and will just digitize features in existing layers. Therefore the TOC should be locked, ...
4
votes
0answers
57 views

How do I implement PyQGIS multithreading to update a progress bar

I am developing a PyQGIS plugin using python. I facing a problem during the implementation of threading in my plugin. I have written a python script which contains a class wrapping all geo-processing ...
4
votes
0answers
65 views

How to choose the EPSG projection?

Up until now for reprojection of my WGS84 vector (.shp) and raster files (.tif), I have been using EPSG projections based on vector/raster central point's UTM zone. But what happens if the envelope-...
4
votes
0answers
76 views

Crop raster based on another raster R

library(raster) How can one clip one raster based on another raster? RasA: class : RasterLayer dimensions : 459, 533, 244647 (nrow, ncol, ncell) resolution : 10000, 10000 (x, y) extent ...
4
votes
0answers
59 views

Insert sequential row and column values automatically into a fishnet dataset

I have a grid that has about 30 rows with approx 15 columns each. I want to label them as A1,A2,B1,B2 etc (Alphabet row, integer is column). Is there any way to do this programatically? There is no ...
4
votes
0answers
91 views

QGIS/OGR shp to tab export - crashing Mapinfo due to number format issues

I created a vector grid in QGIS and it exports as SHP -no issues. When I save as tab and try to open the file in MapInfo it crashes. According to https://groups.google.com/forum/#!topic/mapinfo-l/sO-...
4
votes
0answers
85 views

Thematic map exported using QGIS2Web is extremely laggy

I have made a world thematic map and added layers of data for creating graduated color scheme on the country level. I need a interactive map as an output which shows values when user hover over any ...
4
votes
0answers
30 views

Changes to Clip and Intersect between 2.8 ltr and 2.12 for lines

Clip and Intersect in 2.8 yield the result as expected. When using 2.12 the shape file is empty. To test this I have run both versions on Linux (Opensuse Leap) and OSX. The results are consistent. ...
4
votes
0answers
75 views

Postgis sequence in QGIS not working

I have a Multipolygon-Layer stored in a Postgis-database. The primary key field 'gid' is SERIAL. When trying to add a new polygon in QGis (LYON 2.12.1 on OSX El Capitan), the attributes form shows me: ...
4
votes
0answers
63 views

Calculating angle using three WGS 84 points

I am looking for a way to calculate an angle between two points at a specific third point. My coordinate system is WGS 84. I can measure the angle with QGIS clicken on those three points, but I want ...
4
votes
0answers
97 views

Determining the Thalweg line of a river without bathymetry?

I have the boundaries and centerline of a river. The Thalweg line defines the deepest elevation of a watercourse (see Image taken from Google). I do not have accurate enough bathymetry or Digital ...

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