Questions tagged [digitizing]
The process of converting features on a map or image (either hardcopy or digital) to vector-based data in digital format.
260
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12 views
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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0answers
10 views
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
21 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
38 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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3answers
76 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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1answer
50 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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43 views
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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31 views
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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22 views
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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0answers
14 views
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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0answers
48 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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2answers
60 views
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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30 views
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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0answers
33 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?
2
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1answer
50 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 ...
2
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3answers
507 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 ...
3
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0answers
78 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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1answer
236 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
109 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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0answers
219 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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0answers
66 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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0answers
50 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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0answers
38 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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0answers
78 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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0answers
63 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
202 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/...
3
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1answer
65 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
64 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?
...
1
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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 ...
1
vote
1answer
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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0answers
21 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 ...
2
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1answer
214 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 ...
3
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2answers
461 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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0answers
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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0answers
331 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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0answers
100 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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26 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
136 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
34 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
299 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 ...
4
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0answers
803 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
91 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
votes
1answer
78 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
81 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 "...
8
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1answer
575 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
108 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
229 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 ...
1
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1answer
52 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 ...
3
votes
1answer
466 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 ?
