1
vote
1answer
14 views

Maximum Liklihood Image Classification; Does this algorithm consider RGB Band values only?

if it is correct that Maximum Liklihood classification algorithm takes into account RGB values of the bands only, then is it useless to stack other bandslike NIR SWIR etc prior to go ahead and use ...
1
vote
0answers
11 views

32-bit Map tiles for use with leaflet

I've got a lot of single-band Geotiff files with the GDT_Float32 format and I need to present these over the web, hopefully using a webmap leaflet/mapbox/googlemaps widget where clients can hover over ...
2
votes
2answers
429 views

Clump and eliminate classes in a raster in ArcMap or R

after interpolation of sediment classes, I obtained a raster which looks like the image below (sample of the river). I would like to clump and eliminate areas within the raster that are below a ...
1
vote
0answers
7 views

how change image of marker in leaflet

This is the code; it works very well but the marker image is not displayed. What can be the problem ? //**************************************WFS****************************************************// ...
0
votes
0answers
1 view

OpenLayers3.15.1: Refreshing Layer

First: yes I have searched the whole internet for a solution, but none of the found worked. The situation: var source = new ol.source.Vector({ loader: loaderFunc, strategy: ...
1
vote
1answer
21 views

Leaflet display only clicked element of a loaded map layer (polyline)

I am creating a web mapping application that will return appropriate routes based upon ST_length query on a cartoDB dataset. So far, the code below successfully maps those routes with individual ...
-1
votes
1answer
12 views

Getting started with Geotools? [on hold]

I want to get full guidance for using geotools from scratch in Java language. Can you show me the path or give me the suggestions about where I can start this? I am an intermediate level of java ...
1
vote
0answers
14 views

PostGIS - ST_SetValues is slow

I have large data in my C++ program (up to 3000x3000). I have connection to PSQL with PostGIS. Now I need to store my raster data (greyscale images) in DB raster. I am using ST_SetValues for this and ...
3
votes
1answer
1k views

How to manage the osmosis filters?

I am a complete beginner in OSM and osmosis, and I am trying to build a stripped down version of a local map, in order to add nodes of public lights that would be used for maintenance. I have used the ...
2
votes
1answer
15 views

Hillshade result after mosaicing multiple rasters appears irregular

I am trying to mosaic 19 rasters which i already reprojected in WGS 1984 World Mercator and then hillshading them. These are the steps i follow please correct me if i am doing something wrong. I ...
2
votes
2answers
246 views

No texture after Importing .dae COLLADA to ArcScene?

I'm attempting to export a .dae collada file from Photoscan to ArcScene 10.1. I've followed instructions from a couple of sources, created the file geodatabase, imported the file as a multipoint ...
2
votes
1answer
219 views

MapFragment ArcGis - The specified child already has a parent

I'm trying to display a MapView from ArcGis in Android Studio. I'm using Map Fragments for that, I put in the xml the Map and my other UI stuff. Putting the MapView element in the layout file always ...
0
votes
0answers
12 views

how do I get percentages of classes in a classified image?

I am using ArcMap 10.3 I have two layers, one classified raster, Landsat based dNBR, where classes show burn severity, and a shapefile containing polygons, drawn based on the dNBR image and that ...
0
votes
0answers
13 views

Which points in projected raster corresponds to certain latitude,longitude location?

What I have is a SRTM 3 arc-second raster file in WGS84 geographic coordinate system (here is that file). I then project it to the Azimuthal Equidistant projection with GDAL: gdalwarp -s_srs ...
0
votes
0answers
11 views

Adding row to new empty table using ModelBuilder? [on hold]

I can create a point feature class and start an edit session in ArcMap which adds a row and I can enter data. So far i haven't created a point - just added data to the table. What i want to do is ...
3
votes
3answers
702 views

Measure average distance between two lines with common endpoints

I have two shapefiles, each with a set of lines generated from start and end points. One shapefile has the straight lines generated from the XY To Line tool, while the other has lines generated from a ...
2
votes
0answers
21 views

Can I reorder the points in a GEOS LineString?

Using libgeos, when I buffer() a polygon and then getExteriorRing() [to make a slightly smaller outline copy of the polygon just inside the original], it seems that which point on the new geometry is ...
1
vote
1answer
189 views

Error Opening OpenLayers plugin in QGIS [on hold]

I have installed version 2.12 of QGIS and I have installed the OpenLayers plugin. However, when I try to add a basemap through Web > OpenLayers plugin I get the following error message "An error has ...
1
vote
1answer
531 views

How do I get the vector output segmentation algorithms to work properly in QGIS 2.0?

I'm trying to run the Watershed Segmentation algorithm, specifically, but I have been receiving the same error message using any of the available segmentation algorithms. I'm new to QGIS and have been ...
3
votes
1answer
460 views

Determine when I have crossed state line?

We are currently using the Google Maps API to get route information and total mileage but we would like to determine when we are crossing into a new state. When we return the route information we can ...
3
votes
2answers
147 views

Install QGIS 2.14 Essen on Ubuntu 16.04 Xenial

I'm having trouble installing QGIS on Xenial. `debian` release When I try using the debian release (i.e. without ubuntugis dependencies) I get the following errors (please note there is no xenial ...
5
votes
1answer
2k views

How to create mask bands in GDAL and Python?

I have small program in Python that uses gdal and numpy to perform a logarithmic scale of some data into the RGB 0-255 range. Now this input data has a nodata value set to mask the valid values, and ...
4
votes
2answers
206 views

ENVI to map composition

I'd like to print out 6 images in a single page. How can I do this using map composition tools in ENVI (6 images are year-to-year dynamic images with the same size and the same geo-referencing)?
0
votes
0answers
6 views

Why gdalsrsinfo is not listing the filenames?

I am using gdalsrsinfo to extract the projection details of tab/shp files in multiple folders using the code mentioned below. for /R .\ %%f IN ("*.tab") DO gdalsrsinfo -o wkt "%%f" ...
1
vote
1answer
21 views

How to make an arcpy tool to take multiple inputs csv/text lists, instead of a single input?

It's been only few days that i've been working in python environment. Based on this code, i've been trying to batch few process for our QAQC task's. At certain times, like when i use ...
-1
votes
0answers
22 views

Confusion over Describe properties? [on hold]

Can someone clarify the meaning of the 'fullPropsRetrieved'and 'metadataRetrieved' properties of a Describe object. In particular my confusion is regarding the definitions provided on the ESRI website ...
-3
votes
0answers
17 views

Adding topographic symbols to ArcGIS? [on hold]

Does somebody know how to add topographic symbols in ArcGIS? For example I want topographic symbol for tree, lamppost, manhole, concrete wall, wood, grass, etc... How to make and add it in ArcGIS?
1
vote
0answers
16 views

Use array[] datatype in qgis from postgresql

I'm just a beginner in GIS, so I'll be glad to see any comment here. I have tables in PostgreSQL which I've connected to QGIS. There are columns in tables with datatype array[]. But it's not easy for ...
2
votes
0answers
226 views

How to convert a microstation cell library into a format usable in ArcGIS?

I am in the process of standardising symbology across CAD and GIS and have decided to use the symbols we currently used for points in microstation. These are stored in a cell library. Does anyone ...
2
votes
1answer
188 views

Posting UserCredentials with AsyncTask of ArcGIS for Android?

My problem is that I want to get JSON data from ArcGIS for Server For example: http://xxxx.com/arcgis/rest/services/Map/MapServer/legend?f=pjson I can get and read JSON data from this URL but if ...
1
vote
1answer
193 views

Scripting creation of cogo polylines including curves

Is it possible to create polyline features from cogo type text files? I have some files that have survey type coordinates in them and they contain straight line segments as well as curves (defined by ...
4
votes
1answer
2k views

How to display direction of track with arrows using OpenLayers

I would like to display track on the map using OpenLayers in the way like this: http://jsfiddle.net/DR/hgCUq/1/light/ How to show direction of the track with arrows here? Any other approach would be ...
1
vote
1answer
22 views

Updating table setting a case with ST_Intersection

I'm trying to update a geometry column using this command: UPDATE mad SET geom_p=CASE WHEN ST_CoveredBy(mad.geom,b.geom) THEN mad.geom ELSE ST_Multi(ST_Intersection(mad.geom,b.geom)) END AS ...
8
votes
3answers
3k views

What are the coordinates of the mysterious hole in Siberia?

I am interested in taking a Google Earth aerial view of the mysterious hole recently discovered in Siberia and perhaps doing some hydrological analysis of the area in a GIS. However, there appears to ...
0
votes
0answers
4 views

store the output of gdal_rasterize as a pgraster?

I was wondering when using gdal_rasterize to convert something to a raster, is it possible to store the output raster as the PostGIS raster instead of, say, a tif? For example: I have the following ...
0
votes
1answer
201 views

Why aren't my hyperlinks saving in ArcGIS 10.2

I have a polygon layer and I have a joined table with a link to an excel document for each polygon. Under the "Display" tab in layer properties I check the "Support Hyperlinks using field:" box and ...
0
votes
1answer
79 views

Populating an attribute field [on hold]

I want to add another field to an attribute table, a number field. This number field will show in my opinion the experience visiting the ski resort, from 1 (the worst) to 10 (the best). Those that I ...
0
votes
2answers
690 views

How to set default style of layer using rest api in Geoserver

Hello friend, I want to change the default style of the layer in Geo server using the REST API.For this i get this code curl -v -u admin:geoserver -XPUT -H "Content-type: text/xml" -d ...
0
votes
1answer
51 views

dynamicMapLayer esri-leaflet does not return properties of point data

I am using a dynamicMapLayer with point data. If I bind a custom popup to this layer, it does not return the properties for the point. https://plnkr.co/16IooEUXpoo9fvqlfnhU If I use polygon data ...
1
vote
1answer
33 views

Representing json data on a map with GeoTools (Java)

I'm working on a Web Map Service in Java. Practically this WMS allows me to represent the map of open data type (shp, kml and gml). I'm going to start working even with data in json format, and for ...
1
vote
1answer
21 views

WCS geoserver: Get subset of raster image

I know that WCS is used to get the "raw" data of an image. but is it possible to download only a subset of the image, for example a block of pixel 1000*1000 from the original image? If not, is there a ...
2
votes
0answers
48 views

Problem using processing.runandload() [on hold]

I'm writing a QGIS plugin using PyQGIS and I have a weird problem. When executing following line of code: processing.runandload("qgis:createpointsalonglines", r"Clipped", 1, 1, 0, r"memory:nodes") ...
0
votes
0answers
16 views

Google Maps Timeline - How does the segmentation algorithm work? [on hold]

I'm new to GIS and geo-location algorithms. Google Timeline shows a very nice segmentation of my location data. It clearly identifies periods of time in which I stayed in the same location, and ...
1
vote
1answer
36 views

PostGIS - syntax error inserting GeoJSON

I am trying to insert a GeoJSON into PostGIS, but I am encountering a syntax error. I can't seem to see where the problem is - I'm sure it is an easy issue to resolve, but my inexperienced eyes can't ...
0
votes
0answers
14 views

Distance to river square grids [on hold]

I have a square grid 5X5 km and I want to create a field containing the distance from a river shapefile of each cell. Moreover I would like to have some tips about an inverse correlation between ...
3
votes
1answer
25 views

Calculate area before land uplift

I'm trying to calculate the area of an Island before a land uplift of 9 meters. I have two shapefiles, one with the polygon of the Island and one of the elevation as a pointfile (10x10 raster). Does ...
0
votes
0answers
15 views

Geoserver WMS can connect in QGIS/ArcGIS desktop, but not in OpenLayer3

I have a WMS service publish in my machine, I can conect this service with my Public IP (in other pc) and private IP (local Network) in Arcgis Desktop or Qgis, but I can't view it in openLayer 3 or ...
3
votes
1answer
38 views

How to create custom line symbol with text in it using ArcGIS?

I have some layers for which I have to use special symbology. Most of these symbols are lines (continous, dashed, dotted, etc.) but they have different text in them for example: ...
3
votes
1answer
21 views

Sending arguments to lastools function from python script not working

I`m trying to call the lasground module from a python script, using this method: args=['lasground', '-i *.las', output_file, arg_step, arg_spike, arg_spikedown, arg_offset, arg_bulge, arg_cores] ...
-4
votes
0answers
27 views

GIS Multiple Choice Questions [on hold]

Does anyone have a set of mcqs for GIS? Or know where I could get (separate and apart from a google search?

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