2
votes
2answers
38 views

How to get for a given pixel the values from different overlapped rasters?

I have a few rasters representing different soil properties, like soil pH and sand content. The rasters overlap perfectly, have the same dimensions and same coordinate reference system. I would like ...
4
votes
2answers
74 views

QGIS renders outlines where none should be

QGIS always renders the borders of a feature polygon. How can I disable this? Even if I set Border style to "No Pen" and the colour is exactly the same for different categories there is a small grey ...
2
votes
4answers
111 views

QGIS “Delete ring” no longer works

I have QGIS 2.4.0. Until just today, the "Delete ring" feature worked just fine. Now it no longer works at all. I rebooted and even reinstalled QGIS 2.4, and it didn't fix the problem. But I also ...
1
vote
1answer
40 views

Apply new style to selected features in QGis

Let's assume that I have selected some features in QGis. Now all the features in that vector layer already has some style applied to it. Now, I want to apply some new style to the selected features. ...
3
votes
1answer
35 views

How to select more than one feature using values?

What should I do if I want to select more than one feature using values ? For selecting a single feature, I enter an expression like this which works: "LINK" = 28 Assume LINK as a field in the ...
0
votes
2answers
82 views

Is there a way to “zoom to feature” in QGIS?

I am the GIS Director of a city public works. I have a shapefile that I created of points on each structure and address in the city. We have been working in ArcMap Desktop for 6 or 7 years and depend ...
1
vote
0answers
38 views

Features in .shp can't be identified & won't render

Using QGIS 2.4.0 on Windows 7 Service pack 1. I have several .shp's, all polygons, that give me the following problem: 293 features are listed in the metadata and shown in the attribute table but the ...
2
votes
1answer
94 views

Merge multiple linestring features into a single multilinestring

Using QGis or ogr2ogr how do I convert a vector file containing multiple linestrings features into a single multilinestring feature? At the moment I've been doing this manually by converting the data ...
0
votes
0answers
15 views

QGIS merge selected features tool malfunctions due to geometrical errors [duplicate]

The issue occurs using the 'Merge Selected Features' tool when there are geometrical errors in the features (not all are picked up by the 'check geometrical validity' tool). In 2.2 Valmeria, the ...
0
votes
0answers
33 views

Why is QChainage not assigning linear referencing sequentially from start to finish?

I have a simple linear feature representing a pipeline that needs linear referencing every kilometer. When I add the specifics to the tool it runs fine but my result does not count sequentially from ...
0
votes
1answer
29 views

QgsFeatureList features as QStrings

I am catching the selectionChanged signal and passing the selected layer to the registered method. Once here, I want to know the features that were selected. I do this with a call to ...
0
votes
1answer
66 views

In QGIS are there similare construction tools to ArcGIS?

For a project we are using ArcGIS to reshape autogenerated features. For that we often use the construction tools polygon, rectangel, circle, etc in ArcGIS. The right angle is also an often used tool. ...
0
votes
0answers
13 views

Link/unlink buttions in the Attribute Table's Form View

Toggling the edit button, in the Form View/Table View, buttons for adding/deleting a record is available. Two additional buttons are also available (Fig. 1). From the look of the icons they perform ...
0
votes
1answer
96 views

v.edit break: how to loop through XY coordinates on using GRASS on Windows 7

Trying to follow the suggestions on this thread: splitting a lines layer using points However, how to do so in a windows environment using the GRASS command console is beyond me, so I'm attempting ...
3
votes
1answer
56 views

Qgis creating point within complex shapes (with holes) [duplicate]

I'm looking for a tool to create a point in every polygon, that will be placed in the polygon. these are complex shapes with holes. the point must not put in those holes! the "plugin RealCentroid" ...
1
vote
1answer
59 views

Using QGIS, features are suddenly placed 7.5 thousand kms off correct location

I've been counting an muskrat dens on lakes with aerial photos by creating a feature in a separate shapefile. I checked my progress after doing about 80 small lakes and suddenly, half of the lakes ...
3
votes
3answers
107 views

keeping track of edited features QGIS

Does anyone know of a way to keep track of last added or edited features in QGIS? A kind of Editor Tracking tool.
0
votes
0answers
70 views

Openlayers / QuantumGIS, export or sync features Offline

writing from Spain. I am developing a web application based on OpenLayers , GeoServer and PostgisSQL , packaged under OpengeoSuite . The issue has to do with vector layers and their features. Until ...
0
votes
1answer
46 views

How can i create single feature fwith Combining Selected feature qgis?

I am trying to create a single Qgsfeature from the Combination of selected features in Pyqgis. Currently i create the feature using a loop over selected features and combine them 1 by 1. but this ...
0
votes
0answers
32 views

QGIS 2.0 on Mac - Features disappear after additional edits

I have a plugin that allows users to add features via a dialog choice and then clicking to place points. The results are saved in a shape file, and changes are committed and saved when the user closes ...
0
votes
0answers
79 views

Point features disappear when moved using QGIS 2.0

When I move, either by the node or the move function, a feature symbol on the map canvas, it simply disappears, not just the label, the whole thing. CTRL-Z brings it back. I'm using a MAC OS-X. I've ...
2
votes
1answer
135 views

How to show in a custom QGIS form the feature and/or geometry info?

I need to show point coordinates on the from dialog used to edit the attributes of a point.. I see that in the formOpen the dialog receives a layerId and a featureId, but no iface object, so how can ...
0
votes
0answers
124 views

how can i read an attribute value from qgsfeature?

How can i read an attribute value from qgsfeature ? i am trying to update some attribute using other and i have to read value from attribute in the qgsfeature . my source code: provider = ...
0
votes
0answers
46 views

What is the action name in qgsinterface for the deselect feature from all the layer tool?

I want to add the deselect feature from all the layer tool in the toolbar when the qgis user start editing a vector layer. anyone know what is the name of this action in qgis api 1.8?
2
votes
1answer
328 views

QGIS select feature, “add to current selection” feature

I am trying to perform a feature selection on qgis similar to "add to current selection" interactive selection method in Arcgis Desktop, is that possible? An example: I perform a spatial query and ...
1
vote
3answers
392 views

How to select features of visible layers in QGIS

In QGIS 1.8 I used plugin "Select features of visible layers by rectangle" to know the layer that owns a visible feature. In QGIS 2.0.1 this plugin is no more available. I wonder if it is possible to ...
3
votes
1answer
141 views

Get features in order they are selected using QGIS

Is there a way of establishing the order that a user selected features using QGIS and Python? By example: we have a network of line features representing a road network, and the user defines a route ...
2
votes
1answer
179 views

Can QGIS open folder with “run feature action” tool?

Is possible to open folder with "run feature action" tool? I can open specific file like .dwg, but don`t know how open folder in specific location. This folder contain multiple .dwg files and when ...
2
votes
1answer
147 views

Is there any way to find the shortest distance from a point to a line?

I´m working with QGIS 1.8.0. I have a map divided into many features (thousands of small rectangles) and I have a point at the center of each of those features. I also have a map of the transmission ...
2
votes
1answer
53 views

Divide map into features with invisible divisor lines

I'm working with QGIS 1.8.0. Is there a way to divide a map with a grid but make the divisor lines invisible? I have a shapefile as the one in the left and I want it to see as the one in the right but ...
0
votes
1answer
70 views

How to know the real size of grid? [duplicate]

Im working with QGIS. When dividing a map with a grid I set in the paramters X=0.1 and Y=0.1. Could someone please explain what does that mean? I mean would the map be divided into 100mx100m squares? ...
0
votes
0answers
47 views

Borderlines of states subdividing my GRID

![enter image description here][2]I just merged a map of a country with its states, so I went from having 1 feature (the whole country) to 32 features. Is there any way to have the borders of the ...
1
vote
1answer
108 views

Dividing map into features (whole squares)

I'm using QGIS 1.8.0. I divided a map of a state with its municipalities into many features using a GRID (small squares), but instead of creating one ID per feature (one ID per square), it creates one ...
0
votes
2answers
251 views

How to create a MultiLineString feature with a postgis layer in QGIS

I have troubles handling with MultiLineStrings in QGIS. I added the table where I defined a column as geometry(MultiLineString, 31468) as a postgis layer in QGIS. Now I want to create features with ...
5
votes
1answer
163 views

How to convert a column of numeric IDs to letters?

I'm working with qgis 1.8.0. I divided a map into 500 features (small rectangles), and now I have the doubt if there is any way to change the ID of the attributes from numbers to letters? When I did ...
0
votes
1answer
95 views

How to add information to an attribute table?

I'm working with qgis 1.8.0 and did the following: 1.-Divided my shapefile into 830 features (small rectangles). 2.- Added to my shapefile several points containing weather information using the "add ...
3
votes
2answers
265 views

How can I turn islands into individual features in QGIS?

I have what seems like a pretty straightforward task in QGIS: I have a shapefile that, in some cases, groups multiple separate landmasses into a single feature. For example, the Hawaiian islands are ...
1
vote
1answer
113 views

Why new feature disappears when editing polygon?

I try to create internal polygon within existing polygon. After I created a ring, I add a new feature inside the ring. Suddenly, this new feature disappears. I confirmed that this feature went to the ...
1
vote
1answer
259 views

How to “Merge Selected Features” with python?

I have been looking for the answer to this question for some time now, but can't seem to find it! My problem is straight forward: I have one layer It contains lots of features (only polygons), say ...
2
votes
1answer
183 views

How to fix the “The inserted Ring is not contained in a feature”?

I am trying to add a ring in a feature in a shapefile. This feature is a single part feature but has already a few rings. When I try to add the new ring, I have the error message : "The inserted Ring ...
0
votes
2answers
204 views

QGIS equivalent to “Features to Line” ArcGIS tool

I have a python script in Arc10 that uses the features to line tool. I however don't have the license to run it. I was wondering if there is a Qgis tool or process that would essentially do the same ...
2
votes
0answers
56 views

Is there a way to distinguish between digitized and pasted features?

Is there a way to tell if an added feature in QGIS is in fact a newly digitized one or a pasted feature? I think QGIS is treating both cases in the same way, emitting the same signal: ...
5
votes
1answer
93 views

Is it possible show the feature attributes dialog when I add a feature in code?

I want to know if it is possible to make the feature attributes dialog in Qgis show up when I add a feature by code using: QgsVectorLayer::addFeature( tFeature ) This is available when I add ...
2
votes
1answer
537 views

QGIS identify features button issue

Is there anyway to get the Identify Features button in QGIS to automatically select a layer and provide the information without having to highlight it first in the layers TOC? MapInfo and ArcGIS ...
0
votes
1answer
497 views

How to select multiple features using advanced search SQL in QGIS

I have a layer of planning units covering a large area (there are over 16000 PU's). Three of the columns in the attribute table hold information about which planning units were included in the ...
0
votes
1answer
145 views

How to edit a group of selected features in QGIS?

I am dealing with a large number of planning units across a very large study area. I am selecting a number of features using the advanced search in the attribute table, and would like to edit them ...
0
votes
0answers
85 views

why are split-lines saved in the attribute table? (qgis 1.7.4)

A few months ago I splitted some lines in a shapefile with official roads because they are not accessible anymore. Now I loaded that file again into my project and the splitlines appears. Because I ...
4
votes
1answer
846 views

merge selected features and programming

I have a shape file with UK districts and unitary authorities. In the past, using commuting patterns, I worked out a new geography which is close to travel to work areas. I now would like to create a ...
1
vote
2answers
129 views

Fetching field values from uncommitted features on Qgis

I'm trying to fetch a feature's field value on Qgis, I use QgsFeature.attributeMap().value(cont int & key).toDouble() This works fine for committed features but it always returns " 0 " if the ...
2
votes
1answer
323 views

How to query OSM tags by polygon?

I do not know whether something like this is possible but nonetheless. If I understand OSM correctly all objects essentially have associated tags based on type of object (street, building etc) ... ...