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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16 views
Creating a Construction Tools Rectangle Template
I am working on a project that requires me to place hundreds of 20x20 ft squares as polygons in a feature class. Right now I am manually making them by entering height and width values. I am wondering ...
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0answers
33 views
Digitizing Sampling Frequency [closed]
I am slightly confused about what the term "sampling frequency" refers to with respect to digitizing.
Does it refer to the distance at which the digitizing cursor will "snap" to an existing point?
...
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0answers
14 views
Map Algerba equation desired different outcome
General method how the bathymetry and coastline evolution was set (full question at the end of document)
Bathymetric
Get a screenshot of the bathymetric profile from the Baltic bathymetric data. ...
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0answers
25 views
Measurement units - advanced digitizing toolbar - QGIS
I want to create a polygon with certain dimensions in QGIS. 180x180 feet.
I am trying to use advanced digitizing toolbar in order to create it. But I do not know the measurement units of d (distance) ...
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1answer
17 views
Batch digitization of a fixed set of relative geometry
In support of some watershed work, I need to force flow into several valid sinks that I have burned into my DEM. Flow direction and flow accumulation really don't like sinks so trouble is that the ...
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0answers
28 views
My digitizing lines keep disappearing
I am having a really hard time digitizing roads in a map for an assignment in my GIS course. I follow the steps, I open editor, snapping, I open a window to create a new feature. But when I start ...
3
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0answers
140 views
CadTools plugin functionality in QGIS 3 beyond Advanced Digitising Panel?
I've recently migrated to QGIS 3.6.0, and I've realised that the wonderful CadTools plugin is not compatible with QGIS 3.
I tried to use the Advanced Digitising Panel, but it's cumbersome and not ...
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1answer
58 views
QGIS 3.4.x Properly digitizing polygons of uneven sides
I am facing some problems when digitizng polygons of uneven (irregular) sides using advanced digitizing and none/planimetric measurements for area and length calculations.
In the example image below ...
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0answers
45 views
Quick way to add point features on a map [duplicate]
I am looking for a quicker way to add points. I am mapping the buildings on a satellite imagery, but every time I add a point, I need to press enter to close the action menu.
Is there a way to add ...
5
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1answer
75 views
Prevent user from creating self intersected polygons
i'm working on a project in QGIS 3.4.1 Madeira. I want to prevent users from creating polygons with errors (like self intersection). When I digitize a polygon in QGIS i get a mark where the polygon ...
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0answers
22 views
JOSM-like editing for QGIS
I am used to digitizing stuff using JOSM, the Java OpenStreetMap editor. Recently, I tried some digitizing in QGIS and it felt rather clumsy.
What I was missing specifically was an equivalent to the "...
5
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1answer
151 views
Is there a “Merge Parts” tool in QGIS?
In the advanced digitizing toolbar, QGIS has these 3 tools: Split Features, Split Parts, and Merge Features. Is there a tool or equivalent algorithm for the logical fourth one: "Merge Parts"?
This ...
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1answer
38 views
Creating/digitizing roads using ArcMap editor?
This is probably very basic but I am not able to figure out. I am trying to digitize roads by drawing lines. I go to Editor>Star Editing, select the layer, select my layer under 'create features'. ...
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1answer
43 views
enable Advanced Digitizing Panel (cadDockwidget) with PyQgis
I am working on a PyQgis Plugin where I want to enable cad in advanced digitizing panel. Following pre-conditions are met:
layer is in edit mode
project has projected crs
move feature tool is ...
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1answer
33 views
Find Close Vertices in QGIS
I am trying to find digitizing errors in a line-layer. Obviously the snapping was not activated when the person who digitized created the lines.
As far as I know QGIS cannot find undershoots, so I ...
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1answer
166 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 ?
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1answer
59 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 ...
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0answers
15 views
Draw a shape using dimensions using advanced digitizing tools [duplicate]
Does anyone know how to draw a shape by area. I need to draw a survey area of 3.58km x 3.0km. I have added the Advanced digitizing toolbar --> selected toggle edit --> created new polygon however...
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2answers
98 views
Android App to help digitizing point layers on a Tablet
In QGIS, using a pen on my touchscreen PC I can I can digitize a lot of points (e.g. 14000 pts in 2 hours) faster than with a mouse: without having the attribute form to show up I simply need to touch ...
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1answer
64 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 ...
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1answer
136 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
59 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
116 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
51 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
84 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
70 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 ...
3
votes
1answer
230 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
votes
0answers
30 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
55 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
76 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
votes
0answers
51 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
votes
1answer
191 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 ...
3
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2answers
499 views
Advanced Digitizing 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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0answers
49 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
votes
1answer
90 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 ...
2
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0answers
120 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 ...
2
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0answers
299 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
49 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
285 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
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 (...
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0answers
59 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
vote
1answer
67 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 ...
0
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1answer
360 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 ...
2
votes
1answer
205 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 ...
6
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1answer
337 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
44 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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2answers
1k views
How to 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
81 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 ...
2
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0answers
192 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
votes
1answer
286 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 ...
