Questions tagged [digitizing]
The process of converting features on a map or image (either hardcopy or digital) to vector-based data in digital format.
281
questions
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14 views
Cannot draw straight line polygon in QGIS 3.16
I tried to draw polygon by using add polygon. It should be a straight polyline and then become a polygon but it turns to a curve line like arc (circular line) so that I couldn't draw a polygon. It's ...
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0answers
26 views
Auto vectorization of raster in QGIS 3.14
Is it possible to do an auto digitize of a raster (downloaded and WMS)?
I would like to create vector polygons out of it.
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0answers
15 views
Bearing convergence in digitizing property surveys
I'm digitizing and stitching together a number of adjacent/overlapping property surveys.
The most recent ones provide clear UTM/MTM grid bearings and distances, and in some cases coordinates of ORPs, ...
1
vote
0answers
17 views
Digitizing boundaries for the educational office according to its affiliated schools
I have a layer of administrative boundaries, and within these borders, there are a group of separate schools for boys and girls, and these schools are under the supervision of several educational ...
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0answers
23 views
QGIS spline plugin tool cannot be imported
I'm using QGIS 3.10.14 and installed the spline plugin for digitizing curves. However, I get the error message below when I try and load the spline plugin.
Traceback (most recent call last):
File &...
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0answers
49 views
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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0answers
31 views
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. ...
0
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0answers
48 views
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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2answers
55 views
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 ...
2
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3answers
132 views
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 ...
5
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0answers
36 views
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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0answers
36 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 ...
4
votes
1answer
86 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 ...
9
votes
5answers
208 views
Digitising 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 ...
1
vote
2answers
89 views
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. ...
3
votes
1answer
45 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 ...
1
vote
1answer
229 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, ...
1
vote
0answers
26 views
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 ...
1
vote
1answer
42 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 ...
5
votes
4answers
133 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 ...
1
vote
1answer
18 views
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 ...
1
vote
0answers
58 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
131 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 ...
0
votes
1answer
42 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 ...
0
votes
1answer
125 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 ...
2
votes
3answers
269 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 ...
1
vote
1answer
77 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 ...
0
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0answers
45 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 ...
1
vote
0answers
37 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 ...
0
votes
0answers
36 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.
...
2
votes
0answers
119 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 ...
4
votes
2answers
73 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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0answers
62 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
votes
1answer
60 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 ...
0
votes
2answers
440 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/...
4
votes
3answers
1k 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 ...
6
votes
1answer
135 views
Snapping 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 ...
5
votes
2answers
3k 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 ...
5
votes
2answers
162 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
499 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 ...
1
vote
0answers
111 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 ...
0
votes
0answers
116 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 ...
2
votes
1answer
78 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 ...
2
votes
0answers
103 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 ...
1
vote
0answers
73 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 ...
2
votes
2answers
433 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
votes
1answer
95 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 ...
1
vote
1answer
114 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
vote
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 ...
1
vote
1answer
51 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 ...
