0
votes
0answers
8 views

convert a numpy array into polygons shape file

I have a polygon numpy array, for example: array([[[103, 120]], [[104, 121]]]), array([[[102, 117]], [[103, 118]]]), array([[[102, 112]], [[103, 113]]]), array([[[131, 109]], [[132, 113]. I would ...
0
votes
0answers
6 views

Openlayer georeference location is not correct

I am running QGIS 2.2, Windows 8.1. I have openlayers plugin installed. None of the openlayer sources display in the correct location. For example, Google hybrid displays multiple worlds tiled ...
0
votes
1answer
11 views

ST_AsGeoJSON function slow in PostGIS

I'm currently trying to pull neighborhood data from Zillow's Neighborhood page (http://www.zillow.com/howto/api/neighborhood-boundaries.htm) and then load it onto a leaflet map, openstreetmap. I ...
0
votes
0answers
5 views

Ajax httprequest to python server side script

I want to obtain a vector layer using ajax call to python CGI script. This server-side script is not giving http response back to the client script. I run a test php script and able to get ...
1
vote
1answer
11 views

Querying slope data using raster calculator: why are all results true?

I am using ArcGIS 10.2.2. From a DEM, I have created a new raster showing slope using the slope tool. The color scheme was automatically classified into 9 tiers. What I want to do is query this raster ...
0
votes
0answers
4 views

Fetch from WMTS with gdal_translate

I'm trying to create an input XML file for gdal_translate to fetch tiles from a WMTS service. The service I'm interested in is the Polish Geoportal's scans of topographics maps. The XML format is ...
0
votes
0answers
6 views

Address locator returns no objects found

Trying to build an address locator for the following feature case But unfortunately when I use find locations it finds no object What might be the issue here ?
0
votes
1answer
12 views

How to use field calculator in QGIS to calculate new coordinates, and use that new columm to geolocate a layer's points

In a separate question, at How to shift a CRS by an observed offset, I asked about shifting a CRS to align the problems aligning data points with a satellite image obtained from OpenLayers. (They ...
-3
votes
0answers
32 views

Good thesis topics for GIS? [on hold]

Actually I did intern-ship in flood inundation study of river by using Arc GIS and HEC-GeoRAS so I want to do my thesis related to this with more advancement...any ideas !!
2
votes
1answer
16 views

Why can't I add a Spatialite table with clip results in QGIS?

I have 2 layers and I want to make a clip of layer 1 with layer 2 in SpatiaLite (I'm using the DB Manager within QGIS). That's the code I'm using: create table clipped_lines as select * from lines, ...
1
vote
1answer
33 views

What is the “Auto Open Form” checkbox used for?

Windows 7 QGIS 2.6 - 64 bit Feature - Identify Results Could someone help me understand what is "Auto Open Form" checkbox used for.
2
votes
0answers
40 views

Comparing floor and roof areas using QGIS?

I am pretty new in this GIS topic and I would really appreciate if someone can help me with this problem. I am doing a research for university that shall show the available roof area for ...
0
votes
0answers
20 views

Importing segmentation results from Python to eCognition?

I used OpenCV watershed segmentation to create segmented objects. However, I don't know how to import the polygon objects created (objects inside the blue circle) into eCognition.
1
vote
0answers
30 views

Finding census block with highest pop. value within the census tract

In QGIS, I'm trying to plot a centroid of only the census block with the highest population within each census tract. So there should only be one point per tract- that of the block with the greatest ...
1
vote
0answers
15 views

How to shift a CRS by an observed offset

I have a drone image is which is geo-referenced over a Google Sat. image. These align well, and both use WGS84-Pseudo Mercator (EPSG:3857). I have a set of data points in a shape file which are ...
1
vote
0answers
13 views

Popup with related tables

I'm finding difficulties displaying values of a related table in a popup window. Esri said that at version 3.10 and above, popup templates can include fields from related tables using the syntax ...
1
vote
1answer
34 views

how to Find nearest line for the given point from a collection of lines?

I have table with lines(linestring).For a point wich i give it , I want to find out nearest line in point. I almost developed a query, but it is return the same line every point i give. the query ...
0
votes
0answers
7 views

problem serving MBTiles with Geoserver plugin

I'm creating a webmap, and hoping to add a few basemap/raster layers of my own. I'll be using a stack that includes GeoServer which is fine for vector data, but I'd like to serve the new basemap ...
0
votes
0answers
13 views

implement aspect in least cost path analysis to account for downhill and neutral ground movement [duplicate]

I am creating a least cost path model for large species that migrate over large distances across a rugged landscape (elk, deer, etc.) To calculate movement cost I am using a slope raster but I ...
2
votes
1answer
25 views

Moving dead ahead: rhumb line, great circle or none

I think I understand the whole rhumb line and great circle idea but I can't seem to find an answer on this question. Suppose I am driving a car (i don't use ship because I don't want to put the ...
0
votes
0answers
16 views

Filling polygons automatically

How we can fill polygons automatically like in this example, we have two type of polygons(pink and black) , the first type the black polygons, should grow to occupy the void area between the black ...
1
vote
0answers
16 views

Data format in ERDAS IMAGINE 2014?

I performed radiometric correction analysis on Landsat 8 image ( format: integer unsigned 16 bit) in ERDAS IMAGIN 2014. However, the output image would be created if I could select format: float 32 ...
1
vote
0answers
51 views

How to determine Affine Transformation Parameters? [duplicate]

I try to use the qgsAffine plugin to do the transformation. But no idea in its usage. Anyone can post an example. Many thanks!! How to find the transformation parameters? I found some posts suggest ...
1
vote
1answer
16 views

Add a certain number of days for a date field

I have one field for a permit decision date, and then I have another field for 180 days from that permit date. The permit date field has data entered, but the 180 day field I would like to calculate ...
1
vote
0answers
48 views

Python Basemap fails

I am using Anaconda 2.1.0 and Basemap installation is successful conda install basemap However, I keep getting the following error when I try to project lat,lon to a planar: Assertion failed: (0), ...
2
votes
0answers
46 views

How to get an ArcGIS custom tool to run fom the command line?

I have been experimenting with ESRI's CalculateArea custom tool and it works fine running within ArcGIS from a toolbox. Then I wanted to see if I could run it as a standalone script from the ...
1
vote
1answer
23 views

How to invoke a WFS service from command line?

I've the following WFS GetFeature request .... ...
3
votes
2answers
30 views

Generic term for CRS axes?

We're making a light web front to a database, and I saw this in a test screenshot: Despite those coordinates being nowhere near North America, the "latitude/longitude" label for those coordinates ...
0
votes
1answer
18 views

Line dash not working OL3 (Openlayers 3)

I want to display a dashed line in a vector layer, as the it's shown in the Documentation there is a propriety called lineDash , but it didn't work for me here my code : var iconStyle_line = new ...
0
votes
0answers
17 views

Error generating using SAGA

I am trying to generate a Slope Curvature Raster in Saga, but i am always getting the same error (images with the errors below). And when i use GRASS it generates with no problems. What could be the ...
0
votes
1answer
27 views

eliminate small polygons of a PNG with gdal_sieve

I want to eliminate polygons wich consist of less than 3550 px in this PNG . I tried using gdal_sieve but there seems to be an error. gdal_sieve -st 3550 E8.png -of PNG E8sieve3550_4.png ERROR 6: ...
0
votes
0answers
13 views

Address Locator “Geocoding service”

I've already created an Address Locator sucessfuly and published it as a Geocoding service, but I need to verify that its working from the rest since its not working from my web mapping application ...
0
votes
1answer
20 views

how to generate NDVI with multi channel images?

I have a 6 channel proprietary camera and I need to create a NDVI map. I created a map from each band, so now I have 6 files each one on a different band width. How can I proceed now? I am using QGIS ...
0
votes
1answer
20 views

Default password for geoserver 2.1.4 not working

I have installed geoserver 2.1.4 on Ubuntu 10.04 i have jetty running on port 90. I get to the login screen. I introduce user: admin password: geoserver and i am getting that user or passowrd are not ...
1
vote
1answer
37 views

Why are representations functions accessible in Table of Contents not in Catalog window of ArcMap?

It's really frustrating that adding a new representation form the Catalog window of ArcMap does not work while it works for TOC when adding the required lyr file as a symbology then right click and ...
0
votes
0answers
11 views

How can i read a DGN file by DotSpatial in VB.Net?

I am new in DotSpatial and want to develop a program for converting DGN to Shapefile. I had to use opensource components. At first i want to open a DGN(ver.8). Please give me a hand.
-2
votes
0answers
17 views

How to work data driven page with arcpy? [on hold]

Can somebody share any video or something how to work with data driven page with arcpy?
1
vote
0answers
38 views

Area in KM from Polygon of coordinates

I have polygons from coordinates in (python shapely) that looks like this POLYGON ((24.8085317 46.8512821, 24.7986952 46.8574619, 24.8088238 46.8664741, 24.8155239 46.8576335, 24.8085317 46.8512821)) ...
0
votes
0answers
15 views

Spatial Reference Conversion

I am currently having some problem with the spatial reference projection on the map in Android. Basically I have a base map which is OneMap and all the coordinates stored in database is in SVY21 ...
-3
votes
0answers
20 views

c++ qgisvector layer is not Valid [on hold]

#include <QtCore> #include <QApplication> #include <QWidget> #include <qgsapplication.h> #include <QMainWindow> #include <qgsmapcanvas.h> #include ...
1
vote
0answers
29 views

OL3 27700 WMS inspire

I am just getting into OL3 from a GIS background - I don't have much of a programming background. I am trying to use WMS layers from inspire in an OL3 app ...
2
votes
0answers
36 views

Finding and using data on population density files

I'm attempting to replicate this map for the state of Nevada in QGIS: source: http://www.bostonfed.org/commdev/c&b/2014/spring/map-distance-to-closest-snap-outlet.htm (A SNAP outlet is just a ...
1
vote
0answers
25 views

how to automatically update column based on the second layer, trigger, postgreSQL

I am newbie in postgreSQL. I have 2 tables, observation and landcover, i want to create a trigger which would allowed to update the column observation.land based on the spatial information according ...
1
vote
1answer
26 views

Route and distance measuring

I'm looking for a plugin that can make a route from given GPS points and then calculate the distance of this route. I'm going to create GPS points and import it to Qgis as a GPX file. I know I can ...
-1
votes
1answer
34 views

Search layer in MXDs

I work on arcview 10.3 and i try to find layer called "ways" in several mxds. i try this code but it does not work. anyone know how to do it?: import arcpy,os,sys,string import arcpy.mapping from ...
0
votes
0answers
13 views

How to use ArcGIS rest services with mapsforge or osmdroid?

I want to use ArcGIS rest services with mapsforge or osmdroid . How can i use dynamic map service of ArGIS for server ith osmdroid ? I just want to show a dynamic map with mapsforge or osmdroid? Does ...
2
votes
0answers
30 views

Compute for shortest/perpendicular distance between track point and centerline

I am working on a python school project that uses gpx tracks from different devices. Latitude, Longitude, Elevation and Timestamp are the only information that are constantly available. HDOP, Speed, ...
4
votes
1answer
43 views

How to add Attributes to a polygon with arcpy

I have a question about arcpy. I want to create a polygon FeatureClass with attributes. The code below is just test-code that generates some polygons for speed testing. I want to add some additional ...
0
votes
0answers
45 views

How to inverse Y axis [on hold]

I have a SQLlite database containing cached tiles with X,Y,Z fields and I want to use it in MapCache. My Y field is appearing upside down in Google tile index but I want to inverse it like this: ...
0
votes
0answers
11 views

Representing a line feature layer with Markersymbols in ArcGIS JS API

I am setting a scale dependant renderer for a Featurelayer (geometry type =line) so that in smaller scale it can represented as a marker symbols and in higher scale with a Line symbols. When I tried ...

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