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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How would I go about efficiently digitizing intersecting polygons from a georeferenced map by snapping vertices in QGIS?

I have a map I've georeferenced in QGIS that has a lot of intersecting and adjacent polygons. I want to efficiently snap the vertices together as I draw the polygons because I don't want overlaps and ...
MapDeath's user avatar
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What is this coordinate system from my engineering document?

I have an engineering document from 1991 with coordinates for a region in San Diego, CA. I can't figure which coordinate system is being used here. I would expect "NAD83 StatePlane VI ft" (...
JoshALogs's user avatar
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Stitch land cover shapefiles together into a singular dataset while maintaining the individual land cover classes [closed]

I have been manually digitizing drone imagery to create a training data set for different land cover classifications. I have created a feature class dataset and digitized my different land cover ...
greg684's user avatar
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Setting M Values to nearest foot

I am using 10.8.2, is there a way that after I draw a line the M Values can be auto-rounded to the nearest foot, without me going to "edit sketch" and changing them myself? All I am doing is ...
Wilton Strahan's user avatar
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How to apply digitisation algorithm to raster

I am building a code to apply a digitisation algorithm into a raster and get the results in a shapefile. I built the code and it works, but I keep having issues with the resulting shapefile being ...
jsct's user avatar
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Toggle editing does not work for Digitizing forms in QGIS

I have QGIS 3.32.3-Lima under Ubuntu 22.04.3 LTS. I created a new GeoPackage layer to draw a rectangle. I hence added the tool bar "Digitizing forms" as well as the tool bar "Advanced ...
tflutre's user avatar
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How QGIS's "Remove duplicate nodes" actually works

I am working on digitizing a large number of polygons using stream digitizing, which sometimes creates duplicate nodes. I noticed that in "Layer Properties>Digitizing>Automatic Fixes" ...
Tkerr1's user avatar
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Autoscroll during digitizing in QGIS

I am relearning digitizing using QGIS after 30 years as a MAPINFO user. There is an autoscroll option in Mapinfo that moves the screen automatically if your line needs to continue off the screen. I ...
BJCotton's user avatar
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Freehand digitzing issues in QField

On my fieldwork project I must be able to draw freehand lines in QField. So far I have made it work with connected mouse. When using stylus, I can activate the freehand editing button (actually ...
HL1977's user avatar
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3 votes
1 answer
72 views

Splitting line manually at intersection in QGIS

I would like to split the CA line at the exact point where it intersects the NC line. I try to use the Split Features Tool (scissors) in QGIS but it doesn't cut the line at the exact point of the ...
JoanB's user avatar
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QGIS - How to pin each attribute form to a fixed position while digitizing features

When I'm digitizing data every attribute form pops up in a different place (appears to be incrementally changed coordinates on the screen). This means that when digitising a series of features the ...
SeeWhy's user avatar
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Advanced digitizing tools - snapping last vertex to right angle

My aim is to snap last vertex to the right angle using advanced digitizing tools. I'm running QGIS 3.30 with 'snap to common angles' on - see the picture below. Any ideas?
Adam's user avatar
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QGIS causing recurrent crashes on multiple computers

I currently have lots of issues with multiple computers that crashes more than twice a day when the operators are digitizing vector layers. The computers are strong and run Civil 3D without any issues....
Pyqgis_beginer's user avatar
1 vote
1 answer
1k views

TypeError: QgsRubberBand(): argument 2 has unexpected type 'bool'

I am trying to install the 'Digitizing Tools' plugin in QGIS version 3.30.0-'s-Hertogenbosch but am getting the below error. I am not a GIS tech and have no idea what this means and google is not ...
mcusack's user avatar
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Changing VertexMarkerType in Python standalone

In QGIS > Option > Digitizing > MarkerType, I can change the Value, but in PyQGIS standalone application, I can't find the way to change the value. I try: QgsSettings().setValue("/qgis/...
Artame yoyi's user avatar
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QField not implementing digitizing rubberband fill color option (including Don't update rubber band during node editing) set in QGIS 3.28

I am digitizing features on a map using a project generated in QGIS 3.28 or even QGIS 2.18. Under QGIS the project follows the settings that adjust the fill color of the rubber band (including Don't ...
roger's user avatar
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Georeferenced raster moves when zooming

We have a mosaic dataset that when you zoom in, the image shifts therefore causing our digitizing to become offset. I've attached pictures below. Even when you take away the digitizing, the raw image ...
Leesa's user avatar
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1 answer
225 views

All layer in QField-project are greyed out and not visible

I wanted to create a QField project with orthophotos from different years to digitise a how a river basin changed due to erosion. However, when I load the project in QField onto my iPad it only shows ...
geog's user avatar
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QFIeld: Deactivating freehand button

Is it possible to disable the freehand digitizing mode (button on the left top) in QField? If so, how to disable this?
Lothar Ulferts's user avatar
1 vote
1 answer
518 views

Advanced digitizing tools greyed out

I want to create a rectangle of size 3.2m x 2.1m in QGIS. My project CRS is set to WGS 84 / UTM zone 30N. I have been following answers to similar questions asked here (Creating polygon with exact ...
T1230321's user avatar
2 votes
1 answer
105 views

Creating parallelogram with no right angles in QGIS

I am trying to create a rhomboid, i.e. a four-sided polygon with two pairs of parallel sides but with no right angles. I know how to create rectangles using the Shape Digitizing Toolbar, but is there ...
Jama's user avatar
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Digitizing on raster WMTS time series and storing time information in attribute table using QGIS

I have loaded a raster time series in QGIS as a WMTS layer. The Temporal Controller works fine and I can navigate through the different dates. Now, I would like to digitize polygons on different time ...
Julien's user avatar
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1 vote
1 answer
496 views

Data from map and attribute table disappeared after saving

I am relatively new to QGIS and have been doing some simple georef and digitising work. At the start I lost a lot of data, as I hadn't saved properly, and I have been constantly saving ever since. ...
Andrew's user avatar
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17 votes
1 answer
291 views

Getting area / perimeter / length while digitizing

Is it possible in QGIS to see the area / perimeter of a shape or the length of a line while digitizing (not just after finishing it)? I know, I can use the Advanced Digitizing Panel to get the ...
MartinMap's user avatar
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modify symbol/stroke of digitized line used during digitizing?

I need to digitize line features over a scanned image. (using Qgis 3.26) The line during the drawing of the new feature is barely visible: a very thin full red line on completed segment, thin dotted ...
glenndm's user avatar
  • 105
3 votes
1 answer
290 views

Adding point feature with Geometry by Expression in QGIS

I am trying to use "Geometry by Expression" to add a point feature in a layer but I am getting unexpected results. I added the expression make_point(0,0) but it just takes all the existing ...
David's user avatar
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1 vote
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315 views

Digitizing Toolbar greyed out now in QGIS 3.26.2 [closed]

Since we upgraded QGIS from version 3.16 to 3.26.2 the Digitizing Toolbar is greyed out. I have tried to find the setting that is different between version to unlock it but I can't find it. I need it ...
AmyOTODC's user avatar
1 vote
1 answer
1k views

How to deselect Shape Digitizing Toolbar in QGIS?

I'm using QGIS 3.26 for Windows. Usually, after I create new shapefile layer, I can freely draw polygon by freehand. Suddenly the shape digitizing toolbar Rectangle option is selected and I cannot ...
super kiev's user avatar
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131 views

QGIS 3.22.8-Bialowieza Digitising using Auto Trace but line not following vertices correctly

I am trying to draw a polygon between existing polygons but it does not follow the vertices correctly even though I tried the snapping and enable tracing options. A screen shot is shown with the ...
Mark Tinah's user avatar
1 vote
0 answers
31 views

Snapping centers of objects in map canvas QGIS

I wanna snap object to object basing on their centers in map canvas. For instance, snap center of green polygon to the center of red one. Already stwitched on snapping options (see below). Is there ...
Adam's user avatar
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3 votes
4 answers
350 views

QGIS digitizing points and autofilling attribute value from persistent form

I need to manually digitize elevation point maps. (using QGIS 3.24) Instead of the default QGIS method ( enter point + enter height), I would like to inverse the sequence: specify the height and then ...
glenndm's user avatar
  • 105
7 votes
1 answer
449 views

Looking for QGIS equivalent of ArcGIS streaming digitizing

I am trying to digitize in QGIS 3.14, and I have not been able to find an equivalent to the ArcGIS streaming tool. I was taught to digitize where (you trace the feature with your mouse and nodes are ...
Alexander Audet's user avatar
3 votes
2 answers
195 views

Create identical polygon adjacent to existing

I am currently trying to digitize FEMA flood panels and I was wondering if anyone knows how to duplicate existing polygons within QGIS. Specifically I am trying to have identical rectangular polygons ...
Ian Moffit's user avatar
1 vote
1 answer
131 views

Shifting point where two lines meet in QGIS 3

I am trying to digitize a road network in QGIS 3.10.12. After tracing two lines, I want to shift the point where both lines meet a bit sideways with the node tool. However, only one point from one of ...
mapperx's user avatar
  • 1,407
2 votes
1 answer
74 views

How to efficiently digitize objects in a PostGIS table with more than one geometry column in QGIS?

I have a PostGIS table with more than one geometry column (here: 2), like One geometry is allways set, the other(s) may or may not be set: In QGIS these come as two distinct layers, in my case one ...
Jochen Schwarze's user avatar
4 votes
1 answer
299 views

What is the difference for a shapefile line feature length between "Cartesian" and "ellipsoid"

I use QGIS for a hobby project on American historical railroads. When digitizing a quite short section of railroad line, giving a polyline feature in a shapefile, QGIS gives two values for the line ...
Michiel Rademakers's user avatar
1 vote
1 answer
302 views

Crop map by color

I digitized a map using QGIS. What I have right now is simply the geolocated version of the picture below (including labels, streets, lakes etc.), i.e. the file does not have any layers or attributes. ...
erpunkt's user avatar
  • 21
1 vote
1 answer
337 views

Adding multiple features at once using QGIS

In QGIS, I can add a new line by using the Add line Feature tool. I can also use the Advanced Digiting tool which is helpful. I want to add two line and a point in the middle of the two lines like the ...
RandyO's user avatar
  • 121
2 votes
1 answer
431 views

Add Polygon Feature in QGIS: polygon lines follow cursor when digitizing

I am drawing polygons in QGIS by moving the cursor and clicking to add polygon corners. So, four clicks, four corners to a polygon. All of a sudden, the polygon lines get drawn as I move the cursor, ...
Mark Polczynski's user avatar
0 votes
1 answer
113 views

Digitizing topographic contours to produce DEM from it using ArcMap

I have four topographic maps spanning 60 years all of which have the same scale (1:62,500). I have digitized contours (5 feet interval, 4 contours 285, 290, 295 and 300 feet) of the same section in ...
Chayan Lahiri's user avatar
0 votes
1 answer
101 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 ...
Jonas_Jaeger's user avatar
0 votes
1 answer
83 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. ...
Bellis's user avatar
  • 41
1 vote
2 answers
73 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 ...
Scholar7's user avatar
2 votes
1 answer
469 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 ...
sfetan's user avatar
  • 151
3 votes
1 answer
629 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 ...
Rens's user avatar
  • 39
0 votes
0 answers
68 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 ...
Derek's user avatar
  • 89
7 votes
1 answer
163 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 ...
Enzo Baldini's user avatar
  • 2,297
3 votes
3 answers
884 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 ...
Eon Villa's user avatar
  • 171
0 votes
0 answers
85 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 ...
JayC's user avatar
  • 137
0 votes
1 answer
3k 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. ...
SpatialNasir's user avatar

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