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Questions tagged [digitizing]

The process of converting features on a map or image (either hardcopy or digital) to vector-based data in digital format.

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2
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1answer
275 views

QGIS 3.4 How to make 90 degrees angles when digitizing polygons ? No plugins

How do you make 90 degrees angles when digitizing polygons in QGIS 3.0 or above without any plugins ?
0
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1answer
70 views

Mapping out railways from paper?

I have a physical copy of a map with railways that I want to import directly into ArcGIS (the network of railways), but I have no data on coordinates of any kind (it's a really old map but the lines ...
4
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2answers
4k views

Newly added points disappearing after saving edits in QGIS.

I am adding features to a shapefile point layer in QGIS 2.12 Lyon. When I add the new point I can see it, but once I click the Save Edits button it disappears. When I click Toggle Editing button to ...
4
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1answer
1k views

How to snap and move circles by the center?

I have a point layer, and a polygon layer with buffers of a given radius around each point. I need to move points, and check that each buffer is not above forbidden land/plots. In autocad, you can ...
-1
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1answer
69 views

Digitising Hedgerows as line or polygon?

I have been tasked with digitising hedgerows for a 5x5km area in Wales. As hedgerows are linear features, and thus do not have a wide diameter, would digitising each hedgerow as a line be ...
-3
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3answers
889 views

Is it possible to find the minimum map-able unit (MMU) after creating a map?

I'm not very good with the GIS lingo so I apologise if this doesn't make too much sense! Lets say I have just finished digitising the land cover of an aerial photograph and it's looking like the ...
1
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3answers
74 views

Digitizing lots of points and polygons outside GIS software?

I have orthophoto of marine bottom from which I want to extract several informations. This information can be for example position of animals (i.e. a point) or the position/contour of a rock (i.e. a ...
0
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1answer
216 views

Digitizing polygons by cut or split feature tool in QGIS

For saving digitizing time i created one polygon feature cover all satellite imagery (study area) and styled it outline, tried many tools inside qgis 2.18 to split / cut polygon features (i don't mean ...
0
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2answers
84 views

Add ring feature not available in QGIS

I have installed the version 2.18.24 in QGIS and apparently the plugin 'Digitizing tools' does not include the feture 'add ring' but it was replaced by 'fill ring with a new feature'. However, somehow ...
4
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3answers
4k views

How to Continue a Line Feature in QGIS?

I'm looking for a way to continue a line feature in QGIS. I have checked the Digitizing Tools plugin (both regular and advanced) for a Prolong Line tool, but I haven't had luck. In ArcGIS there's a ...
2
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0answers
271 views

Copy polygons to another layer with different attribute

I am working in QGIS 3.0.2-Girona. I am digitizing images in which there are rocks that can be encrusted, totally or partially, by algae. I want to have a polygon for the rock and one for the algae. ...
0
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1answer
141 views

Undo a new point while digitising? [duplicate]

How to undo a point while digitizing with QGIS 2.18? I am digitizing polygon features.
3
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0answers
176 views

Unable to find Arc/Curve tool in QGIS? [duplicate]

I am trying to digitize curved roads in QGIS but cannot find the right tool. I want somthing like end point arc segment in arcmap as shown in figure below.
2
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1answer
116 views

Draw polylines given distance & azimuth

I am trying to draw a polyline from a single reference point. I have each specific segment of the lines Azimuth & distance. In the sequence I have areas where my line shifts over +90 / -90 of the ...
3
votes
1answer
356 views

Digitize objects in a LiDAR point cloud?

I am working with LiDAR point cloud data of road networks. The goal is to digitize all visible objects like hydrants, streets, sidewalks. My input data is available in LAS or ASCII format. My first ...
2
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0answers
32 views

Error creating new polygons. QGIS

When I work in QGIS and try to fill gaps between polygons creating another one over them (project snapping settings are selected as Avoid intersection), I hope "fill" this gap with just one polygon ...
2
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0answers
75 views

QGIS 3D digitizing workflow

I want to digitize features in QGIS from an orthophoto and set the z-value of each node from a dsm/dtm. What is the best workflow for this? The solution might be to simply set what layer the ...
1
vote
1answer
108 views

Quick add vertices when creating feature (QGIS 3.2)

I am creating a new feature (polygon) in QGIS 3.2.2 and would like to easily add the vertices as I delineate a boundary. Currently, I can do this one by one as the cursor snaps to the vertex of the ...
2
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0answers
60 views

Available snapping points for advanced digitizing?

In QGIS, the Advanced Digitizing tools have some snapping features that I don't see mentioned in the documentation. We know that we can digitize new segments that are perpendicular or parallel to ...
3
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1answer
308 views

Splitting rectangles into a desired number of parts in QGIS

I'm working on a project using QGIS and there is a process that I'd like to try to automate. I'm working with the "rectangles,ovals digitizing tool" plug-in to make perfect rectangles. The next step ...
1
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0answers
50 views

Why does adding polygon in QGIS sometimes create a feature with edge too far across the screen? What am I doing wrong?

While digiting/creating new polygons in QGIS some polygons have elongated edges. Some features have no geometry (area=zero) too. What could be the reason? I use 3 Monitors, one for QGIS, one for ...
2
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0answers
168 views

Adding land survey info to QGIS?

I am looking for help digitizing or adding info from survey plans into QGIS. In this example I'm trying to add the lease boundaries highlighted in yellow and the pipeline right of ways to the right ...
0
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1answer
73 views

Digitised problems - Combine isolines

I try to digitize a large number of topographic maps. Digitizes the contour every four meters. I use the program ArcGIS 10.3 and ArcSCAN. The problem is that it has many objects in the map outside of ...
2
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1answer
289 views

Line feature reshape tool reshapes unselected lines

I have QGIS 2.18.18 installed in my PC. I need to reshape large number of roads/tracks to match with Imagery. QGIS Reshape tool reshapes roads that are not even selected. Any suggestion? Below are ...
3
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1answer
88 views

raster topo map with gaps to DEM

I'm trying to create a DEM from this raster map: I managed to clean all the shapes and text. I tried to write a program which finds the curve pieces and connects them. But, I realized that it is not ...
2
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0answers
350 views

QGIS 3.0 vertex tool - select current layer only?

I am using the vertex / node tool in QGIS 3.0.2 to move vertices in a line layer. Part of the new behaviour is confusing / annoying and I don't know if anyone can tell me how to change the relevant ...
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0answers
53 views

Fixed length line segment in QGIS: why does helping circle not appear always?

I am working with fixed line lengths. Advanced Digitizing Panel is activated and I set the line length. Usually there is a the blue "helping" circle whose radius is the value entered in the distance ...
2
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1answer
369 views

How do I control the snapping features in the Advanced Digitizing Panel in QGIS 3.0.3?

I am using the QGIS (3.0.3) Advanced Digitizing Panel. I would like to control the spaping characteristics. The QGIS documentation states that by selecting the "gear" drop down icon... You can also ...
1
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1answer
127 views

Seeking program to highlight and calculate multiple areas on satellite image? [closed]

I would like to calculate the area of all the parking spaces in my city (North Miami Beach). I would highlight the parking in two layers, commercial and residential, and then export it to Excel and ...
0
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2answers
2k views

QGIS 2.18.2 - Digitizing Error geometry type is not compatible with the current layer

I have an issue with digitizing lines in QGIS 2.18.2. I was using cadtools and after digitizing lines in my Lines layer on saving i get the message: --Could not commit changes to layer (insert layer ...
0
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1answer
22 views

Adding polygon feature from one data to another

I am using ArcGIS 10.2. I have two polygon files: Data A and Data B. I am trying to add a couple polygons from Data B to Data A. In the editing mode, is there a way to pick the shape of a polygon (...
1
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0answers
89 views

Hotkeys for DAT/EM Summit Evolution linking into ArcMap functions instead

I'm using DAT/EM Summit Evolution to do feature mapping in stereo. When I try to use the hotkeys set in Summit, they instead execute functions in ArcMap. ie. when I press "0" which is linked to CAD: ...
1
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1answer
69 views

Free rotating SVG point symbols

I have to rotate a great number of point SVG symbols (valves, caps, Te, etc.) in order to fit them with the gas distribution network. SVG rotating could be achieved by creating a field with angle ...
1
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1answer
650 views

Digitizing dimensioning and annotations

Digitizing a utility network is feasible in QGis, but I face great difficulties to digitize the huge number of annotations and dimensioning attached to the network. I try to achieve this operation in ...
1
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0answers
44 views

Searching 'select by color' for raster or map data [duplicate]

I'm planing to create an online map component with which the user can create/draw polygons based on underlying raster data. Is there some library / tool / procedure existing which enables the ...
3
votes
2answers
157 views

How to digitize a “ringed” topographic-style choropleth map?

I have a choropleth map of plankton distribution in the ocean that I am digitizing. However, as you can see, there are many features within features creating rings, almost like mountains on a ...
3
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0answers
65 views

Digitized points are getting displaced automatically in QGIS

We are capturing 100's of drilling sample locations in QGIS. At times, we are copying the whole set of points from adjacent survey_lines to the next one. After that, we will capture the respective ...
4
votes
1answer
45 views

Accuracy assesment of an automatic line digitizer!

I have a polyline map which I extracted automatically and I want to compare it with another polyline map which I extracted manually in order to evaluate the accuracy of the automatic method. (my study ...
5
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1answer
457 views

Quickly temporarily disabling snapping in QGIS 3?

In some other applications I use you can use one of the "shift" keys to disable snapping for a single operation. Is there an equivalent for the new node tool?
1
vote
1answer
45 views

Unsnapping two items that have accidentally been snapped in QGIS 3?

In QGIS 3 how can I "unsnap" two items that have accidentally been snapped? So far the only way I have found of unsnapping is to delete the vertex and re-add it.
0
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0answers
103 views

Fixing digitized map using QGIS?

I have some cartographic maps I need to fix the position/digitizing. If you look on the below image you will see that the point layer is not exactly at the center of the map. The exact center is ...
4
votes
3answers
3k views

How to implement Add feature action from PyQGIS

I'm trying to implement / reuse Add Feature functionality in my python plugin. there a class/function that handles geometry creation on canvas based on layer geometry definition? I'm checking API but ...
2
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0answers
229 views

How to reset the reshape tool in QGIS after 'unknown exception'?

I am using QGIS 2.18.16 and most of the time I have successfully been using the reshape tool to change the shape of polygons. I have snapping and tracing enabled. Occasionally when I right-click to ...
6
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2answers
4k views

Creating/drawing “freehand” polygon features in QGIS?

I installed the Freehand Editing plugin but it doesn't seem to work with the latest version of QGIS; the icon appears on the Ditizing Toolbar but the icon is disabled. Is there any way to use a ...
3
votes
1answer
384 views

Advanced Digitizing Panel angle units

I have QGIS 2.18.3 installed. I'm trying to change angle units from degrees to Gon/gradians (90 degrees = 100 Gon). I navigated to Settings--> Options --> Map Tools --> Preferred angle units, and ...
10
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2answers
1k views

How to rectify polygon shapes in QGIS?

I have some polygon-shapes in qgis-1.7.0 and want to ensure that every polygon is a rectangle. See image below. Is there any way I can do this in QGIS (or any other f/oss)? Or how can I improve my ...
1
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0answers
80 views

How to create a line through contours?

I am using QGIS 2.18.14. I want to create line through contour lines with fixed segments, automatically. I already tried manually with 'Advanced Digitizing Tools'. It works fine but too slow. The ...
3
votes
1answer
172 views

Digitizing Menu unavailable in QGIS 2.18.15

I installed the latest version of QGIS 2.18.15 and the Digitizing menu seems to have disappeared in the properties options of vector layers. I want to enable the 'Use Last Attribute" feature
4
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2answers
4k views

Adding Eastings and Northings as attributes automatically to a point layer in QGIS

I have a point layer that I am adding to and am working in British National Grid. Two of the columns are Easting and Northing. When I add a new point I want these two columns to be filled out ...
1
vote
1answer
255 views

Advanced Digitizing Tools Crashing in QGIS 2.8.1 x64 on Ubuntu 14.04

I'm hoping someone here can tell me what I'm doing wrong... Whenever I use the Advanced Digitizing tools in QGIS, I crash after about 5 clicks. I'm even doing it without OTF transformations on. Any ...