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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1answer
22 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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4answers
4k views

Auto populating XY fields when new point feature digitized using ArcGIS Desktop?

Is there a way for ArcGIS Desktop to populate a field automatically when a new point is dropped on the map? We have our map in State Plane Feet, and we want to the database to automatically add WGS ...
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8answers
43k views

How to create polygons with straight lines and right angles in QGIS?

When creating a polygon, how do I do it so that the lines are straight (90, 0 degrees, etc.) and when I create corners they can be right angles? For instance, how do I create a perfect square or ...
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3answers
13k views

How to digitize building footprints with orthogonal edges?

Using QGIS, I am trying to digitize an old raster map, and because I ultimately want to load these 2d layers into sketch-up to turn into 3D models, I need everything to be square. Here's a sample of ...
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4answers
111 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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1answer
28 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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1answer
16 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 ...
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0answers
20 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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15 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 ...
33
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2answers
66k views

Enabling “Snapping” in QGIS while drawing polygons?

I tried to draw polygons in QGIS 1.7.0 and somehow I can't find or failed to find the "Snapping" option. I'm used to ArcGIS 10.0 where you have some snapping options, like placing points of polygons ...
2
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1answer
89 views

Fixed length line segment in QGIS: why does helping circle not appear always?

I am working with fixed line lengths. Advanced Digitizing Panel is activated and I set the line length. Usually there is a the blue "helping" circle whose radius is the value entered in the distance ...
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4answers
5k views

How to Continue a Line Feature in QGIS?

I'm looking for a way to continue a line feature in QGIS. I have checked the Digitizing Tools plugin (both regular and advanced) for a Prolong Line tool, but I haven't had luck. In ArcGIS there's a ...
2
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1answer
111 views

Drawing rings in QGIS

I plan to use for positioning and tracking of areas worked for underwater mining. I am trying to draw rings using Rectangles Ovals Digitizing plugin. But there is very little info available.
2
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3answers
576 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 ...
2
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3answers
96 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
42 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 ...
12
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4answers
2k views

How to rectify polygon shapes in QGIS?

I have some polygon-shapes in qgis-1.7.0 and want to ensure that every polygon is a rectangle. See image below. Is there any way I can do this in QGIS (or any other f/oss)? Or how can I improve my ...
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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 ...
2
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1answer
264 views

Designing circle label with many attributes in ArcGIS for Desktop?

Without using ArcPy, how can I create a circle label show many pieces of information from an attribute table in ArcGIS? I have image about planning zone map, with specific label on top of objects, ...
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0answers
23 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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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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0answers
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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0answers
32 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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0answers
52 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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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
36 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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6answers
4k views

Digitizing Free Satellite Imagery in QGIS without getting Alignment issues with Openlayers Plugin

I am trying to digitize OpenLayers data (such as Google satellite imagery) with no success. Whenever I try to move or zoom the canvas the vector layer I digitized loses the position relative to the ...
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0answers
35 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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0answers
1k views

Digitizing in stream mode in QGIS, using a tablet?

How to digitize in stream mode in QGIS, using a wacom cintiq tablet? Freehand it's no use. I need something like MNDR stream digitizing extension for arcview 3.x, which allows continuous tracing, ...
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3answers
1k views

Changing map scale in ArcMap after almost finished digitizing [closed]

I'm just about to design a map that represents different areas in my immediate living environment. I Unfortunately made a big mistake at the beginning of my project. The current scale is given by ...
4
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3answers
867 views

Conditional value map widget in QGIS

I am looking for a way to implement conditional value mapping in QGIS. This means that the values available in attribute number 2 depend on the value provided in attribute 1. Example: If the user ...
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1answer
51 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 ...
3
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1answer
66 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 ...
2
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3answers
2k views

How do I change the snapping sessions for a layer in QGIS 3

In QGIS 2 I would go the the settings menu and select the snapping options but this option is not there in version 3. I have found the snapping options in digitising options but these don't seem to ...
5
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2answers
590 views

Heads up digitizing of rooms and doors using ArcMap

I am digitizing the floorplans of various schools in our county. This is for the Fire Department so they want to be able to see where doors are within the building. The doors do not necessarily have ...
3
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0answers
80 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 ...
3
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2answers
2k views

Can't Find the Split selected features with selected line from another layer tool

I'm trying to split a selected polygon features with a selected line from another feature layer. I, however, can't seem to get the tool for this to show up in my advanced digitize toolbar. In ...
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1answer
358 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
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2answers
114 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
247 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
70 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 ...
2
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2answers
1k views

Digitizing Map To Scale?

Is it perfectly acceptable to produce a map at a scale of 1:24,000 from a database that was digitized from a 1:100,000 scale source map?
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0answers
56 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
39 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
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0answers
80 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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2answers
222 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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0answers
66 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 ...
6
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1answer
3k views

Using Advanced Digitizing tool in QGIS?

I would like to use the Advanced Digitizing tool and the Move tool to move entire polygons by specified distances and angles. For some reason the "d" (distance), and "a" (angle) fields are grayed out....
1
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1answer
66 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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