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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3
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3answers
685 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 ...
2
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1answer
103 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.
0
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1answer
30 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 ...
1
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1answer
65 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 ...
2
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1answer
249 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, ...
2
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1answer
42 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 ...
1
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1answer
49 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 ...
10
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2answers
11k 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 ...
5
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2answers
587 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 ...
2
votes
1answer
95 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
56 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
1k 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 ...
1
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1answer
69 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
86 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 ...
1
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0answers
73 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
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0answers
44 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
27 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
28 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
62 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
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2answers
118 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
45 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
2k 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
47 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
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1answer
44 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 ...
2
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3answers
585 views

Freehand editing without holding down mouse button in QGIS?

I am trying to delineate wetlands using satellite imagery in QGIS 2.10.1-Pisa. I'm using the Freehand Editing plugin. Is there a way to draw polygons without having to hold down the mouse button, ...
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0answers
14 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
111 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
votes
2answers
295 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 ...
5
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2answers
2k views

How to automate 'downstream' and 'upstream' manhole ID field in a pipe line feature

I have been digitizing a drainage network and now have been supplied attribute fields to add to the features I have digitized. Two of the fields for the pipe features are 'upstream manhole ID' and '...
0
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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
76 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?
1
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0answers
192 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 ...
3
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3answers
3k views

“Node tool: could not snap to a segment on the current layer” message

I have a strange issue. Editing a layer with node tool I get always the following message: "Node tool: could not snap to a segment on the current layer." This error happens to me even with a fresh ...
0
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2answers
9k views

Extracting polygon in Google Maps?

I need to define the boundary of a number of towns. I have found maps of some of the towns in google maps but have no idea how I can digitize or export them for use in ArcMap. So far i have not seen ...
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0answers
23 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 ...
1
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1answer
65 views

Creating Feature Shape Templates in ArcMap?

Working in oil & gas, I find myself drawing the same polyline shapes over and over again in my company's pipeline database. For example, a 12" valve set might always have the same dimensions, a ...
1
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0answers
94 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) ...
32
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2answers
60k 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 ...
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0answers
187 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 ...
3
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0answers
548 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 ...
30
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7answers
36k 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 ...
4
votes
1answer
980 views

Create rectangle by entering width & height numerically in QGIS?

I need a quick way to create rectangles with set with & height in meters. Is there a straightforward way to do this? I am well aware that there are a number of ways to achieve this, but all that I ...
1
vote
1answer
79 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 ...
0
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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
77 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 ...
3
votes
4answers
5k views

Figuring out map scale when you know the spatial resolution of a Satellite Image?

I'm interested in figuring out how map scale and satellite pixel size (spatial resolution) are related. For example the TM or ETM+ has roughly 30m ground resolution, then, what could be the finest ...
1
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0answers
49 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 "...