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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23 views

QGIS reshape tool and enable tracing (snap) tool

I know how to increase or change the size of a polygon with the reshape tool, but can you also use Enable Tracing tool with it, as you can with drawing a new feature?
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1answer
43 views

QGIS transparent polygon returned after digitizing

After the digitalization of my raster map as per below: I saved it in .geojson format and .kml format. The geoJSON works fine: but once I export as a kml and open (in Google MyMaps), then I have ...
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145 views

Closing polygon with right click on Mac OS using QGIS?

I frequently use QGIS to digitize satellite imagery or georeferenced maps. Recently, however, the Add Polygon Features and Add Line Features have stopped working - I can Add a Polygon Feature and ...
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61 views

Snapping a polygon layer to another layer automatically

I have two polygon layers in QGIS 3.4: Layer A and Layer B. These two layers have been digitized separately. Some features in these two layers are crossing or not meeting each other in some areas ...
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77 views

Split polygon with selected line from another layer in QGIS

I am trying to split a selected polygon ("regions") with a selected line from another layer ("streets") in QGIS 3.8.3. In the example below, I want to split the selected polygon coloured in yellow ...
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89 views

Automating line adjustment to a point or a series of points in ArcGIS Suite?

There are multiple toolboxes in ArcGIS Suite that deal with geographic transformation and correction, such as Spatial Adjustment, Rubbersheeting, and Snap. I'm not sure how to best use a tool to ...
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102 views

Freehand editing in QGIS

Is there a way to cut polygons in QGIS using freehand tool? Unfortunately Freehand Editing tool in QGIS 2.x does not provide such functionality. There is a tool for cutting polygons with standard ...
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51 views

How to delete vertex and keep topology

I work with line vector data (road network).The lines (roads) includes several vertexes. I would like to have for each line only nodes - at the end of line, or at the intersection of n lines. How can ...
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28 views

QGIS 3.4 losing edits after saving [duplicate]

I have constant problems in saving edits in QGIS. I have seen this behaviour with multiple geometry types, namely polygons, multipolygons and points. Say that I want to update a value in one cell of ...
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30 views

QGIS Advanced digitizing switch from Cartesian to Ellipse

I´m trying to draw a line per length, but I need to enter the length in the Ellipse value. Is there a way to switch the values in the length window in the advanced digitizing panel from Catesian to ...
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64 views

Split selected feature with selected line from another layer in QGIS LTR 3.4.9

Can't seem to find that tool since I switched from QGIS 2.14 to 3.4.9 It doesn't seem to be included in the Advance Digitizing Toolbar like before.For now, I re-installed 2.14 since I need to use this ...
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50 views

QGIS 3.4.10 for Mac users…Digitzing polygons

I have just installed the LTR version of QGIS (3.4.10) and am having trouble telling QGIS when I have finished a polygon. In fact, I can't. It used to be in earlier versions that to end a polygon you ...
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2answers
128 views

Aligning an edge to match another edge

I'm new to QGIS and I wonder whether there is a tool that helps to adjust the edges between two or more polygons; similar to that topology tool that's used in ArcGIS. http://desktop.arcgis.com/en/...
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1answer
50 views

Unremovable objects/lines QGIS 3.x [duplicate]

How can I remove "red lines" that become permanent to my map canvas while trying to digitize different shapes. The program just leaves the outline of what I'm trying to draw. It still remains even if ...
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1answer
48 views

Digitize image / fantasy map without projection

I have an image where I know the distance between two points in meters (say 800). How do I import this image in QGIS (3.8) so that I get this distance when I measure with the tool in the toolbar? ...
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1answer
19 views

Adding points along line by clicking on it using ArcGIS Desktop?

ArcGIS for Desktop 10.6.1. I have a polyline (old railroad track). I'd like to add the train stops as points along it by clicking on the places. I have georeferenced historical maps as the ...
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1answer
45 views

Split feature from polygon that's entirely within all other features' boundaries in QGIS

I'm splitting a polygon into various features for small-scale land cover delineation. One area I need to delineate into its own feature shares no boundaries with other features, it is an irregular ...
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15 views

Adding vertices at a centerline node not working in QGIS3

I've recently installed QGIS 3.4. Earlier today, my vertex tool showed a virtual node at the center of line segments (as it should with the new node tool). This is no longer showing while editing the ...
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1answer
152 views

Fill attribute-table on feature-creation based on intersection with other layer

I am digitising line-features based on WGS-84 point-coordinates from a PDF which cannot be copied from. The final line layer should contain lines which each connect two points and have the following ...
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2answers
327 views

Line Offset Tool in QGIS 3 not working between different layers

In QGIS2 it was possible to use the lineoffset tool between two different layers. You could for examle use a polygon from a different layer to generate an offset line in your linelayer. In QGIS3 this ...
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39 views

Does the Google Earth API offer tools for capturing points from handmade points on paper maps?

My student team has been tasked with creating a software tool to help a fish biologist import the hand-drawn location markers on his paper maps to a digitized format, simply an output file with the ...
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211 views

Using a Wacom Tablet and pen for QGIS, can I pause my free-hand polygon before I am finished, and then continue?

Is there a way to pause the free-hand tool in QGIS so that I can lift the pen off of the screen, and then continue my polygon again when I am ready? I have learned how to pan while free-hand drawing ...
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79 views

When using a Wacom Cintiq tablet and pen, can you pan while creating a feature using the freehand polygon plug-in in QGIS?

Is there a way to pause the free-hand tool in QGIS so that i can pan and move over the image and then continue my polygon?
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24 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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98 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
30 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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215 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 ...
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599 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
81 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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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 ...
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1answer
77 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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57 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 "...
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355 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
85 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
165 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
46 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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361 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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81 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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2answers
140 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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95 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
267 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
109 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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336 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
187 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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262 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
78 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
443 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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34 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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86 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
119 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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