Questions tagged [digitizing]
The process of converting features on a map or image (either hardcopy or digital) to vector-based data in digital format.
293
questions
0
votes
1answer
34 views
Automatic Tracing (not tracking) of polygons in QField
Does QField support the Auto-Tracing Tool like QGIS does? Like shown in the picture above.
I tried to export my QGIS projects with the activated Auto-Tracing tool, but in QField the tool doesn't seem ...
0
votes
0answers
14 views
Align polygon borders by underlying raster values
I have an interesting problem: I have polygon borders that correspond roughly to "value-boundaries" in a raster (areas where the raster values are clearly distinguishable between two areas).
...
0
votes
1answer
20 views
Multi- to single-part on a subset of features
I have a question about the multi-to single-part function.
How can I apply this process to a specific multipart?
I have several multiparts, but only want to resolve one of them into its objects. ...
1
vote
2answers
45 views
Digitizing photographs of a map
Is it possible to digitize the photographs of very old maps, having no co-ordinates. The photographs are exactly like this. If possible, could somebody tell me how to proceed? I have access to ArcGIS ...
2
votes
1answer
94 views
Allow overlapping polygons in QGIS [closed]
When I draw a polygon in QGIS that overlaps an existing polygon from the same layer, QGIS automatically clips the overlapping area from the new polygon.
Is there a setting to preserve the shape that I ...
3
votes
1answer
70 views
Digitizing toolbar is gone in QGIS
For some reason the digitizing toolbar is gone in QGIS even though I checked the box:
Do you have experience with this and know how to get the toolbar back?
EDIT:
When making it as small as possible ...
0
votes
0answers
49 views
Index issue with digitising OS MasterMapdata from OS Data Hub in QGIS
Using QGIS 3.18.3 (Zurich). From the OS Data Hub (https://osdatahub.os.uk/) I've brought in the OS MasterMap "Topographic Line" data, via WFS/OGC API - Features option, and this has loaded ...
7
votes
1answer
99 views
What is the correct geometric predicate in filter for aggregate function?
I have a layer with parcels ('flurstuecke') and a layer with subdivisions ('flure'). I want to digitize parcels and autogenerate the correct number of the subdivision with an attribute formular.
It ...
0
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0answers
52 views
QField Freehand Digitizing, Smarthphone
I would like to use the freehand digitization tool for QField, but this does not work. I want to use it on a Huawei Y6 with an electric stylus pen. The edit mode is activated, a polygon layer is ...
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0answers
21 views
Digitizing in ArcGIS Pro
I am digitizing in ArcGIS Pro and suddenly the 'create structure and difference polygon' I had used earlier are grayed out and I can't access them again.
1
vote
2answers
196 views
QField Freehand Digitizing Tool
I saw the latest update of QField 1.8 wherein users are allowed to draw/digitize in freehand lines/polygons geometries.
I was wondering how can it be enabled in QField?
We badly need it in our ...
0
votes
0answers
47 views
Digitizing polygons against georeferenced map using ArcMap
I am drawing polygons of counties over a 17th Century map that I have georeferenced. I have an issue with this version of ArcMap which I haven't experienced with past versions.
The shape keeps closing ...
0
votes
1answer
165 views
Entering UTM coordinates with decimals using ArcGIS Pro
I have UTM coordinates containing decimals (e.g. 884305.145mN). I need to create a polygon using the Absolute X,Y,Z feature in ArcGIS Pro.
But ArcGIS Pro doesn't seem to allow decimals in UTM degrees.
...
1
vote
1answer
68 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 ...
0
votes
0answers
64 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.
1
vote
0answers
27 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
18 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 ...
0
votes
0answers
28 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 &...
0
votes
0answers
51 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 ...
1
vote
0answers
36 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
votes
0answers
54 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 ...
1
vote
2answers
90 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
votes
3answers
270 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 ...
6
votes
1answer
61 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. ...
0
votes
0answers
65 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
141 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
236 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
268 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
70 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
346 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
1answer
45 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
43 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
160 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
89 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 ...
0
votes
0answers
224 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 ...
1
vote
1answer
58 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
264 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
448 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
97 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
votes
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
40 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
47 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.
...
4
votes
2answers
85 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 ...
0
votes
0answers
82 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
65 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
653 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
2k 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
326 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 ...
6
votes
2answers
5k 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 ...
