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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1answer
308 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 ...
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2answers
130 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 ...
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0answers
410 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. ...
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1answer
230 views

Undo a new point while digitising? [duplicate]

How to undo a point while digitizing with QGIS 2.18? I am digitizing polygon features.
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334 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.
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3answers
80 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 ...
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1answer
484 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 ...
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0answers
36 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 ...
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93 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 ...
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1answer
120 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 ...
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0answers
77 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 ...
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1answer
500 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 ...
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1answer
3k views

Using Advanced Digitizing tool in QGIS?

I would like to use the Advanced Digitizing tool and the Move tool to move entire polygons by specified distances and angles. For some reason the "d" (distance), and "a" (angle) fields are grayed out....
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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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1answer
170 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 ...
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259 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 ...
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0answers
391 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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1answer
82 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 ...
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1answer
432 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 ...
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1answer
25 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 (...
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0answers
124 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: ...
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1answer
77 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 ...
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1answer
928 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 ...
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1answer
357 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 ...
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1answer
551 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?
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1answer
46 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.
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3answers
2k views

How do I change the snapping sessions for a layer in QGIS 3

In QGIS 2 I would go the the settings menu and select the snapping options but this option is not there in version 3. I have found the snapping options in digitising options but these don't seem to ...
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0answers
114 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 ...
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0answers
248 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 ...
3
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1answer
470 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 ...
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0answers
90 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 ...
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1answer
187 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
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1answer
109 views

Drawing rings in QGIS

I plan to use for positioning and tracking of areas worked for underwater mining. I am trying to draw rings using Rectangles Ovals Digitizing plugin. But there is very little info available.
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2answers
196 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 ...
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0answers
54 views

QGIS Value relation end and Start points while digitizing

I do a lot of pipes/pits digitization and i am trying to streamline the process. I am attempting to fill "To" and "From" field when digitizing lines with the IDs from a point layer they are ...
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2answers
239 views

A accurate tool for digitization in qgis

I have some raster maps that need to be digitized. Me problem is that some of the shapes are very hard to be digitized. Take for example the circles that need to be digitized in this map Now matter ...
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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 ...
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1answer
370 views

Connect newly drawn lines to existing lines in QGIS?

I need a simple tip for drawing line shapes in QGIS. I have multiple line shapes in my project that needs to be connected, so is there an option to join my already drawn line with the line that I'm ...
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0answers
38 views

Custom Tool for creating a cirle out of straight segments

I used to use an old tool coded by somebody that would create a circle much like the current ESRI Circle tool, but it would make the circle out of straight segments with many vertices. The dll can ...
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2answers
2k views

Snapping multiple nodes of a polygon to the nodes of a line?

I am working with vector polygons that have derived from hand drawn areas from when mapping was carried out with tracing paper over paper maps. Therefore many of the polygons don't exactly line up to ...
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1answer
119 views

How to digitize a plot in QGIS

I need to digitize a plot (not a map) that consists of several polygons. I tried some open source options to digitize a plot (for example here is a list of suggestions), but I didn't find yet a free ...
4
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1answer
1k views

Create rectangle by entering width & height numerically in QGIS?

I need a quick way to create rectangles with set with & height in meters. Is there a straightforward way to do this? I am well aware that there are a number of ways to achieve this, but all that I ...
4
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1answer
271 views

Does the precision of digitized points vary depending on scale in QGIS?

I have been editing the locations of some points in QGIS. The scale that I am using varies between 1:6000 and 1:12000 depending on the area that I am looking at. I have been seeing some irregularities ...
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1answer
447 views

Use line style to adjust rubberband in QGIS?

I am digitizing lines and have to keep certain distances to other lines while digitizing. Normally I would just use a buffer to generate these prohibited areas and snap to these polygons while ...
6
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1answer
227 views

Drawing points around polygon in QGIS?

I'm drawing many blocks like these Then I need to surround them by points at fixed distances from each other like so But I have a lot of blocks, and many points to calculate the distance, and then ...
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2answers
791 views

Filling gaps / holes in a shapefile?

I have a shapefile that looks like this: I want to delete the holes, but I can't use any of the editing tools apparently... What can I do?
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0answers
170 views

QGIS 2.14.11 Problem Deleting Features

I have recently upgraded to 2.14.11 from 2.8.2. I opened an old project which hasn't been opened since before I upgraded and came across an issue. I started editing a vector layer which was already ...
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1answer
46 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 ...
2
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1answer
100 views

Digitizing with Cut Polygon Tool

I am working a project that consists of manually digitizing geology layers from a scanned map. At the moment my process consists of me digitizing the small polygons and then the larger areas around ...
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0answers
141 views

Digitizing overlapping hatched range maps

So I have a book of range maps for species within a taxon. As they are presented, many of them are hatched (or stippled, etc.) and overlap ("cross-hatching" shows two species coexisting in the same ...