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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Adding point features by machine learning in QGIS 3.16

I've got several georeferenced traditional maps and there are circles on it. (these are the studied points) So I want to add point features to the middle of the circles. I could do it manually, but I ...
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Construction mode multiple points

Is there a way to define multiple points to snap in the construction mode in advanced digitizing? Let's suppose I want the value -26- from point 3 to 4 but also want a value -31- from point 1 to 4. ...
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QField: Add and fill ring tool

When editing a polygon in QField, the polygon is highlighted in red. This makes it almost opaque and difficult to use the fill ring tool if digitising over a feature shown on the base map below. Is ...
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QGIS Advanced Digitizing on drawing new feature with 60 degree angle

I am trying to draw a 60 degree line from the long line whenever I draw a long line regardless the angle of the long line. But right now when I am using advanced digitizing tools and 90 degree means ...
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Digitizing and adding attribute values to the points in QGIS

I want to build a digital terrain model from nautical charts. I need to capture the points where depth is indicated in the chart, and for each point, I must attribute the depth value. One by one, to ...
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Adding nodes automatically without clicking the mouse

Is there a way in QGIS (or maybe in another GIS (ArcMap, for example))) to automatically create nodes at a given interval when digitizing a raster? For example, I decided to create a Polyline object. ...
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24 views

Advanced digitizing and measurement tool

I want to draw a polygon with 18m x 2m using the advanced digitizing tool. When I measure the size after creating with the measurement tool, the lengths of the sides do not match up (drawn sides vs ...
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1answer
64 views

Offsetting Advanced Digitizing lines from north in QGIS

In QGIS, I'm trying to draw some polygons (mostly rectangles) on a grid, with neat 90-degree right angles and such. All the polygons should be parallel or perpendicular to each other. The problem is ...
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175 views

How to digitise animal positions in aerial photos?

Digitizing objects from orthophotos can be done using QGIS. It is just a matter of establishing a points vector layer with the right attributes and working through the QGIS user interface. Counting ...
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2answers
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Connecting end points of a line in QGIS

I have this line. You can't see the rest of the line in the picture but It's only one line and I want to connect the two ends to close it and convert it into a polygon. I don't know how to connect it. ...
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37 views

Rotating a selection of features around their individual centroid rather than the combined centroid

The rotate feature in QGIS 3 allows you to select multiple features at once and rotate them around the centroid of their combined geometries, as found in the documentation. You can also use an anchor ...
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96 views

QAD Plugin QGIS

Is QAD compatible with QGIS 3.14 "Pi"? I've several issues with it. Only with the points, the rotation and simetry does not work. Polygons and lines work perfectly. Rotate, simetry, etc, ...
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QGIS - using fill ring and snapping to segments not working

When using the fill ring tool and having to run along the edge of the polygon the fill ring tool works perfectly when snapping to a vertex, but when I try and snap to a segment, which appears to work ...
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34 views

QGIS 3x - categorized style customization function for more than 1 cryteria

I want to write down the function for my polygons in QGIS, which will customize more than 1 criteria. I am based on my previous situation, which has been solved here: QGIS 3x - categorized style ...
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125 views

QGIS 3x - categorized style customization based on a part of the string

I have a problem. I am digitizing the map and I want to distinguish one group of polygons from the other group. The basic difference between them lies in their ID (string). One of them has the ID ...
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Quickly digitising several polygons based on classified raster output using ArcGIS Spatial Analyst

I have a raster DTM of a river which I would like to split into 90 sections, each measuring 125m. I have used Euclidean Distance to outline each section by reclassifying the symbology to change colour ...
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How to set my own QDialog Form instead QGIS QgsAttributeForm

I'm working in a QGIS plugin which its functionality is to facilitate the creation of custom attribute forms with complex logic to QGIS users without python knowledge. In order to do this, the user ...
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Using Raster Tracer in QGIS v3.6.1 and it's not working

I've been trying to use raster tracer to trace some lines on simple rasters in QGIS v3.6.1, but when I use the plugin it returns the following error: 2020-06-22T11:48:25 WARNING Traceback (most ...
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1answer
27 views

Automatically fix overlaps by weight/occurrence

I'm working on a project where I have asked a number of individuals to digitize the same features on the same satellite image. For example, an image of a coast where a group of individuals each draw ...
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1answer
67 views

Adding new nodes or moving segments with Vertex Tool in QGIS 3.10

I'm used to work with simple polygons and the vertex tool. But now the Vertex Tool doesn't show me the capability of adding new nodes in centerline neither move polygon's segments. The function just ...
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175 views

Transferring Z attributes to polygon layer in QGIS 3.10

I have a point layer with the z attribute (and there is a field with the same z value). I have digitised a polygon, snapping to the point layer. How can I transfer the z value from the point layer to ...
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59 views

I have a collection of map rasters in various projections. How do I use QGIS to convert them to simple latlong?

My name is Samuel Philippian and I am new to this forum. I am an American high school student who is interested in tectonics and geophysics. I am currently building a global database of sutures, major ...
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Digitized polygon not lining up with others of same coordinate system

To start: I created a new polygon shapefile to represent an old site boundary. I set the spatial reference at the time the shapefile was created. I then started an editing session and digitized a ...
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Automatically filling area surrounded by other polygons?

I want to fill the gap with a polygon automatically. It is surrounded by other polygons but the part inside the yellow circle is another shapefile. The gap is not made by adding a ring. Or is my only ...
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Did Digitizing tools last update remove polygon cutting?

In a previous project i used the Digitizing Tools plugin to cut polygons from other polygons. But it seems that with a new update that feature is removed? I can't seem to use the most of the buttons. ...
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My map digitization is offset to the original georeferenced raster

So I after I was done digitizing on a georeferenced raster map saved my work and then got back to it after while, found out it's offset to the original raster. Note that I tried to rotate my work ...
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92 views

Advanced Editing Options in ArcGIS Pro

In QGIS there are "Advanced Editing Tools", which are able to measure distances and angles of the feature being digitized as you are drawing it. Does ArcGIS Pro also have this capability? I have a ...
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Digitizing historical Brazilian map in QGIS3.4

I am trying to overlay a map of a historical boundary (in .tif format) onto a Brazilian shapefile with subnational administrative boundaries. My general question is: what is the most direct (and ...
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QGIS 3.10.1 advanced digitizing tracing on PostGIS layer fails when using the reshape tool

is anyone here familiar with tracing on PostGIS layers. I'd like to trace on a PostGIS multipolygon layer from another PostGIS multipolygon layer. I made the following steps: Open Project --> ...
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46 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
53 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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254 views

Digitizing PNG image in QGIS

Following Getting polygons from PNG images for the QGIS Shapefiles I intended to digitize the following PNG image in QGIS 3.8 following this instruction: https://www.qgistutorials.com/en/docs/...
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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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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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1answer
1k 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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2answers
148 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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385 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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90 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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84 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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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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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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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
334 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
78 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
91 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
20 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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47 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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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
290 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
645 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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