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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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0answers
770 views

How to OCR topographic maps

I have old topographic maps that I have scanned and converted into PDF in Acrobat XI 11. I need this PDF to be text-searchable (not mere image). To do this I tried text recognition in Acrobat but it ...
2
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2answers
625 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 ...
3
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1answer
875 views

Digitizing RGB TIFF automatically using ArcScan

Is it possible to digitize RGB TIFF by color? I need to select all the vegetation cover types from the image below, which is a part of an aerial photography of an island (http://george.wildlifeintel....
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4answers
17k views

Digitizing raster automatically? [closed]

I have a raster (.sid extension) file. I want to digitize roads automatically in ArcMap, QGIS, etc. Digitizing by hand would be too time consuming. How can I do this ?
5
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1answer
170 views

How to insert some holes in a polygon?

I have a problem with QGIS digitizing advanced tool plugin. I have a landcover-like shapefile. I have to perform some corrections on it, and I have to cut or split some polygons. I want to insert ...
4
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1answer
1k views

How to enable snapping when moving multiple features at once?

Is there a way to enable snapping when moving two or more features at once?
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0answers
46 views

QGIS Value relation end and Start points while digitizing

I do a lot of pipes/pits digitization and i am trying to streamline the process. I am attempting to fill "To" and "From" field when digitizing lines with the IDs from a point layer they are ...
2
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2answers
3k views

How to go with…somewhat complex geological maps in QGIS?

Just a follow-up to this question QGIS: Line to polygon conversion. Not sure do i have to continue there itself... We are currently digitizing a geological map...which has 36 features in total. Some ...
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2answers
219 views

A accurate tool for digitization in qgis

I have some raster maps that need to be digitized. Me problem is that some of the shapes are very hard to be digitized. Take for example the circles that need to be digitized in this map Now matter ...
5
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4answers
6k views

Looking for an efficient way of digitizing building footprints using orthophotos and ArcGIS 10

In the past I've used PCI Geomatica to do something similar using the softwares classification functionality. Are there some tools/tricks in ArcGIS that will partially automate the process. I remember ...
7
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2answers
8k views

Extracting road and building features from raster data using ArcGIS Desktop?

I work with raster data and my task is to digitize a big image. This consumes much time just for digitizing roads and buildings! I'm looking for tools to simplify working on raster data to digitize ...
2
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1answer
42 views

Editor Tool, Areas instead of Segments in ArcMap?

I'm studying this tutorial: https://learn.arcgis.com/en/projects/get-started-with-arcmap/lessons/predict-the-impact-of-the-proposed-road.htm But I can't complete the "Digitize the proposed road" ...
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3answers
1k views

Digitizing Tools error in QGIS

I receive this message: Digitizing Tools: Amend Line is disabled because layer CRS and project CRS do not match. If I set the CRS of the layer the same as the project CRS (W84 Pseudo Mercator) is ...
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1answer
318 views

Connect newly drawn lines to existing lines in QGIS?

I need a simple tip for drawing line shapes in QGIS. I have multiple line shapes in my project that needs to be connected, so is there an option to join my already drawn line with the line that I'm ...
4
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2answers
1k views

Snapping multiple nodes of a polygon to the nodes of a line?

I am working with vector polygons that have derived from hand drawn areas from when mapping was carried out with tracing paper over paper maps. Therefore many of the polygons don't exactly line up to ...
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0answers
37 views

Custom Tool for creating a cirle out of straight segments

I used to use an old tool coded by somebody that would create a circle much like the current ESRI Circle tool, but it would make the circle out of straight segments with many vertices. The dll can ...
1
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1answer
113 views

How to digitize a plot in QGIS

I need to digitize a plot (not a map) that consists of several polygons. I tried some open source options to digitize a plot (for example here is a list of suggestions), but I didn't find yet a free ...
2
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1answer
494 views

Line to polygon conversion

Currently we are working in a geological project..in which all the Contacts, Linear & some other geological features have to be captured. The thing is most of the features have to be Captured as ...
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0answers
84 views

Creating sub-polygons based on underlying basemap?

I'm looking at ranging patterns where animals go in and out of nature reserves into residential areas. In addition to home range polygons, I've generated polygons made from applying 25m and 50m ...
7
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0answers
853 views

How to digitize 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, ...
4
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1answer
257 views

Does the precision of digitized points vary depending on scale in QGIS?

I have been editing the locations of some points in QGIS. The scale that I am using varies between 1:6000 and 1:12000 depending on the area that I am looking at. I have been seeing some irregularities ...
6
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1answer
410 views

Use line style to adjust rubberband in QGIS?

I am digitizing lines and have to keep certain distances to other lines while digitizing. Normally I would just use a buffer to generate these prohibited areas and snap to these polygons while ...
6
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1answer
184 views

Drawing points around polygon in QGIS?

I'm drawing many blocks like these Then I need to surround them by points at fixed distances from each other like so But I have a lot of blocks, and many points to calculate the distance, and then ...
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2answers
585 views

Filling gaps / holes in a shapefile?

I have a shapefile that looks like this: I want to delete the holes, but I can't use any of the editing tools apparently... What can I do?
3
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2answers
2k views

Resuming (continuing) digitizing polygon feature from any vertex in ArcMap?

When I digitize in ArcMap with a Wacom tablet and a pen I often accidentally double click and finish my sketch. More often then not the accidentally finished sketch crosses itself. I would like to ...
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2answers
209 views

Making digitization more detailed afterwards with QGIS?

I digitized already two areas, bordering each other on one side. Then I realized that more detail was needed! What do you suggest as a fast way to do so? Adding each time new dots/vertices takes so ...
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0answers
142 views

QGIS 2.14.11 Problem Deleting Features

I have recently upgraded to 2.14.11 from 2.8.2. I opened an old project which hasn't been opened since before I upgraded and came across an issue. I started editing a vector layer which was already ...
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0answers
264 views

Polygons of Land Use Change? [closed]

I am doing a project where I am digitizing a map of Haiti from the 70s. Through R2V I digitized the lines and then I exported it into ArcGIS 10. I am just interested in the land use change, therefore, ...
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0answers
126 views

Digitizing overlapping hatched range maps

So I have a book of range maps for species within a taxon. As they are presented, many of them are hatched (or stippled, etc.) and overlap ("cross-hatching" shows two species coexisting in the same ...
2
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1answer
3k views

Advanced Digitizing Error CAD tools are not enabled for the current map layer

Using QGIS 2.8.4. I want to use the Simplify function so turn on the Advanced Digitizing menu. The panel displays an error "CAD tools are not enabled for the current map layer" and the error message ...
2
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1answer
86 views

Digitizing with Cut Polygon Tool

I am working a project that consists of manually digitizing geology layers from a scanned map. At the moment my process consists of me digitizing the small polygons and then the larger areas around ...
8
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6answers
4k views

How to Digitize Free Satellite Imagery in QGIS - 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 ...
2
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1answer
224 views

Georeferencing CAD drawing against point data and/or raster image?

I am working on a project to identify households within certain buffer areas of a proposed water pipeline. I have raster imagery of the area of interest, point data for the households, and a CAD ...
1
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1answer
4k views

How to indicate flow of a watershed feature?

While tracing and digitizing rivers, streams, rivulets, etc., is it possible to indicate the direction/flow in the shapefile on QGIS? I'd like to avoid using map labels. Ideally, when done tracing, I ...
2
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1answer
427 views

polygon/polyline digitizing techniques for geological data

My current work involves extensive digitising of historic geology data - essentially the creation of new polygons and polylines based on overlain raster and vector layers. This is all done manually ...
2
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1answer
366 views

Visualizing roads with curved arrows in QGIS?

I need to show a double arrow at the beginning and end of a road feature. When I use arrow in QGIS 2.18 every intersect has separate arrow like this:
2
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1answer
586 views

Digitizing JPEG image or georeferencing it first?

I'm a new learner when it comes to QGIS. I have a JPEG image and I want to convert it into a shapefile. The problem is when I polygonized it, the resulting image is inverted. So I decided to just ...
3
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2answers
240 views

Georeferencing map with known Central Lat-long and distances?

I have the scanned copy of an Old Map which was created using a Plane Table survey, and based on my reading of literature around it, is supposed to be quite Accurate. The central Lat-long is known, ...
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0answers
66 views

QGIS - digitising polyline on Google maps base

I'm displaying a Google Street map via the Openlayers plugin and hand-digitising a route to find out its length. As I pan the map the digitized line keeps shifting slightly on the basemap. I'm using ...
3
votes
1answer
192 views

QGIS 2.8.1 (Windows 64bit). Setting snapping to the “decoration” grid?

I was wondering if anyone knew of a way to snap digitizing to the grid you can create in View>Decorations>Grid? I can't see anything in the manual or the menus so I am thinking there probably isn't ...
3
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0answers
268 views

Split selected features with selected line from another layer not creating all new features

Trying to use the split selected features with selected line from another layer to split a polyline in 2. I run the tool and get the following output: In the attribute table there are now 2 ...
10
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2answers
10k 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 ...
9
votes
1answer
5k views

How to capture a rectangle within the Quantum GIS software?

I want to use "capture polygon" function in QGIS software to draw the indoor office cubical which is a rectangle shape. But the "capture polygon" function is not able to draw a perfect rectangle shape....
9
votes
1answer
2k views

Is there a way to automatically snap loose points of lines to close by vertices with Quantum GIS?

I have a vector layer of lines that were drawn with the snapping option off. I need to have them snapped but, there are hundreds of lines. Is there any solution to do this automatically or semi-...
1
vote
1answer
835 views

OpenLayers 3: Digitizing holes (donut polygons)

I am working on an OpenLayers 3 digitizing tool, which works very fine at this point. I would like to add a functionality that lets me add holes to existing polygons. I know this is doable in ...
4
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1answer
3k views

OpenLayers 3: Change drawing style, but keep style of previously drawn features

I created a vector and a drawing interaction: // Create feature collection and vector var featureCollection = new ol.Collection(); var vectorSource = new ol.source.Vector({ features: ...
4
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0answers
58 views

QGIS Updating three layers at a time by editing the edge where all the three layers concur

I have a map with three main layers: Roads (Polygons) Sidewalks (Polygons) Curbs (Multilinestrings) I need to adjust the edge where all the three layers concur to the cartography layer (the gray ...
1
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1answer
440 views

OpenLayers 3: keep sketch after measuring

I followed the official OpenLayers 3 Measure example to implement measuring in an application. It works fine, but when I finish my sketch by double-clicking it dissappears. In the following ...
3
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1answer
164 views

Digitizing Airport approach-zone with z information in QGIS? [duplicate]

I'm trying to create a vector layer in QGIS out of this Z-dimensioned approach-zone for an ongoing multi-criteria analysis: * The oval shaped base should be 59,56 meters high (Z) For every "ring" z-...
0
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0answers
12 views

Importing OpenStreetMap data in ArcGIS for Desktop? [duplicate]

It is possible to import data in QGIS but ArcGIS has more features and easy to use, so is there any way to import OSM data and we can use ArcGIS tools for analysis and database creation?