-3
votes
0answers
34 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 !!
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.
9
votes
7answers
5k views

How to georeference a vector layer with control points?

I have a non-georeferenced vector layer that I need to be georeferenced. With raster layers the task is easy and straightforward, but I have no idea what should I do with my vector layer. I have a few ...
1
vote
1answer
112 views

How to rescale vector data? [duplicate]

I've got some old maps in dxf format. QGIS imports them correctly but with a nonsense scale. It can export the data it gets to shp of course. Does anyone know how to rescale vector data so it can be ...
4
votes
2answers
695 views

QGIS affine - form of equation

I am at the mercy of a govt authority who have provided utility information in a cad format with a 0,0 origin and a nonsense grid. About a dozen files, the grid and origin are entirely arbitrary. To ...
1
vote
1answer
73 views

How to snap Vector Layer projection to Raster layer projection in QGIS?

I have raster in correct projection. I used ShapeFiles, and marked objects(manually), but i found out that my vector layers have different projection, so they have different size and position. Is ...
1
vote
1answer
64 views

calibrating vector line in qgis

I have loaded GPS points into a QGIS vector layer. I also imported a vector line from a dxf file which doesn't have georeferencing. I would like to fit in line geometry between the GPS points - how ...
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 ...
1
vote
1answer
254 views

Can't select points with a rectangle (ArcMap)

I am using ArcGIS 10.2, ArcMap and I have a shapefile point layer in which I can't select any points. (I'm having the same problem this person describes but none of the suggested solutions work: Why ...
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 ...
2
votes
1answer
18 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
34 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.
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 ...
2
votes
1answer
102 views

How to prevent users from removing QGIS layers?

I need to prevent users from removing layers. In my plugin code I use the following to achieve that: QgsMapLayerRegistry.instance().layersWillBeRemoved.connect(self.dontremovefunc) def ...
2
votes
2answers
262 views

Is there a vector affine transformation tool in QGIS2?

In QGIS 1.8, I can transform my point layer with the plugin "Affine transformation". So, this plugin don't exist in QGIS 2.0. Do you know a method to simply translate (i.e : X -> X+30000) in QGIS 2 ? ...
10
votes
6answers
5k views

Which tools and methods can be used to create isochrones?

I'd like to get an idea for what's involved in creating isochrones for a series of sites, with a reasonable degree of accuracy to the estimates. A general outline would be great, though my scenario ...
4
votes
2answers
1k views

How to compute parameters for QGIS Affine transformation?

I have a vector floorplan (DXF) that I've added to a blank project in QGIS using the Dxf2Shp plugin. I've been reading tutorials and StackExchange threads, but I can't seem to find out how to ...
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 ?
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
0answers
62 views

How to create a floor plan KML file from a DXF in QGIS? [duplicate]

I import a building floor plan from DXF format to QGIS. When I export it to KML format and then import it in Google Earth, how can I put the floor plan to my desire building location? MY CRS is WSG84 ...
1
vote
1answer
203 views

problem with popup conclusion on pressing a marker

I have markers on pressing to which popup has to be brought. how to make it? (coordinates of markers undertake from a DB) var map; var markers; function ejecutar() { init(3); ...
1
vote
1answer
230 views

importing data into CartoDB [on hold]

I've tried several ways of bringing my spreadsheet into CartoDB (.csv, .xls, .xlsx). However I keep getting a message like: An error ocurred when importing your data Error 99999 Unknown What ...
5
votes
1answer
165 views

Moving a shape around the earth while maintaining the proper projection

What is the transformation needed to be taken on every data point of a shape to rotate that shape around the globe. I'm trying to figure out the math behind this kind of transformation so I can ...
5
votes
2answers
5k views

Rotating a vector layer in QGIS with qgsAffine (or other method)?

I would like to rotate a set of vector points in QGIS an arbitrary number of degrees around a central point (or arbitrary point). This is similar to a recent question about creating a regular grid; ...
1
vote
1answer
556 views

Using Affine Transformation to expand polygons in QGIS

I have a shape file, and I'd like to grow each feature by 13.7% or 14%. The program crashes every-time I try to use affine transformation. Any recommendations? I don't have a license for ARCgis. ...
1
vote
1answer
92 views

QGIS batch affine transformations

I have multiple polygon and line shapefiles on which I would like to apply a translation so I was wondering if it is possible to batch process them (maybe with graphic modeler ?) or do I have to ...
1
vote
1answer
48 views

Digitizing roads from a scanned map

I have a scanned map in which roads are shown in red color, the RGB value being R>250, G=0 and B=0. Is there a way to auto digitize the roads by specifying RGB criterion or snap criterion? My ...
1
vote
2answers
146 views

OpenLayers label without using StyleMap

I need to show label of each feature based on attribute field value. I know that I can use ${attribute} notation for this purpose. But this approach works only if I make StyleMap and pass it to vector ...
0
votes
1answer
69 views

Loop does not move on to the next row?

As you can see in the First picture, I have parcel 220, and i want to determinate the position of each of his neighbor ! So the idea was to calculate the bearing between the centroinde of 220, and the ...
0
votes
1answer
106 views

Action zoom in a button

In my code, I have a button that displays information in my gridpanel and it add a vectorlayer in it. I want to add zoom on those polygon, but I did not succeed My code: testlayer.events.register( ...
7
votes
5answers
5k views

Tutorials for GeoServer

What are sources where I can learn how to use GeoServer? I know of these two sites: http://geoserver.org/ - which in fact is not working (at least at the moment) ...
1
vote
2answers
292 views

Dynamically Reload OpenLayers Marker Layer based on user input

Not really sure how to ask this, so I'll outline the scenario. We have a database with locations in it. There are various types of cars at each location and each car has a problem of varying ...
1
vote
0answers
16 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 ...
0
votes
1answer
137 views

How can I copy columns from layer 1 to layer 2?

I have two layers, the first layer is pipe: that has some fields (column) title like : length, id, material. Also I have another layer that is empty (without any fields). How can I copy fields ...
0
votes
2answers
200 views

How to extend polylines to the nearest point

Hi could anyone tell me a way of getting my polylines to search for a point within a certain number of meters of their start/end points and extend to it? edit: There was some broblem uploading a ...
3
votes
1answer
112 views

How to calculate the intersected area from a layer with overlapping buffers in qgis

I need to calculate the area of landusetypes in 50m around various dots (all in one shapfile). My problem is, the buffers around the dots are overlapping each over in some places. I tried to ...
0
votes
0answers
14 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
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 ...
12
votes
11answers
8k views

Python GDAL package missing header file when installing via pip

I asked this question on Stack Overflow before I realised this site existed. As this site it more appropriate, I'll ask it here too. I'm trying to install gdal from pip pip install gdal inside a ...
0
votes
1answer
110 views

Is it possible to have measurements in centimeter and decimeter in 2D flat (geometry)?

Is it possible to have measurements in centimeter and decimeter in 2D flat (geometry) for ArcGIS?
0
votes
1answer
150 views

Open Source GIS Problem [closed]

I am new at open source GIS platform. I am using Ubuntu 12.10. I have tried to install the followings but without 2-3 tools I could not install anyone. Can any body help me how can I install the ...
0
votes
1answer
429 views

Creating MySQL database for storing imported KML?

I need to create a MySQL database for storing coordinates from a KML file with the structure as follows: <Placemark> <name>someplace</name> ...
0
votes
1answer
187 views

Pull pixmap image source from ui edit text in QT

I'm putting together a custom form for QGIS identify using Qt Designer. One attribute has a file name to the accompanying photo of the feature. I'd like to have the photo label in the form grab the ...
1
vote
2answers
194 views

Vector to Collada

I am curious if there is a way to export from a vector format (ie: shapefile for PostGIS table) to Collada (.dae). ogr2ogr will do to GML and KML, but not Collada. My preference is to use open ...
0
votes
1answer
94 views

request two layers in search action of one PanelForm

here's my case: i have a panelForm with 4 fields, and a search button, that search for the features that correspond to the 4 fields given by the user. and i have two layers that both contains the 4 ...
0
votes
1answer
39 views

buffering one feature class by different distance, the result is the buffer distance become same 100 feet

try: # Import modules import arcpy from arcpy import env # Set the workspace env.workspace = r"C:\Esripresspython\GISTPython\Data\City of Oleander.gdb" # Create a variable with the name of ...
0
votes
4answers
104 views

How to extract Z data from a point layer

I have created a point layer with ~150 points. I have a DEM beneath it, which is where I have taken the X and Y values from. Does anybody know how I can retrieve the Z values, without using the info ...
4
votes
2answers
81 views

How to build cylinder or cube multipatch objects in ArcGIS?

I'm trying to visualise a series of boreholes, which consist of points on the ground surface, and soil sample values taken at 0.01m depth intervals (in a related table). eg in this screenshot, I've ...
2
votes
1answer
59 views

Correcting addresses with Python or Model Builder

I am trying to make a script in Python (or Model Builder in ArcGIS) for correcting addresses. I have a point shapefile with the addresses (it has X and Y, and fields for "number", "street name", and ...
13
votes
3answers
10k views

What is difference between FID and OID in ArcGIS platform?

What is the main difference between OID and FID in Esri software?

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