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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7
votes
1answer
7k views

Is there a QGIS bezier curve tool?

I'm a recent convert to QGIS but have been confused about the lack of support for drawing curved shapefiles, especially when Arc has almost too many. A lot of the work that our consultancy do is based ...
2
votes
1answer
181 views

unable to draw polygon without attribute window popping up? [duplicate]

I'm fairly new to QGIS and an trying to draw a polygon via "Adding Feature". When I make the first left click to start, the attribute window pops up instead of letting me continue on with additional ...
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 ...
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 ...
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 ...
2
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1answer
512 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 ...
6
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2answers
4k views

Creating/drawing “freehand” polygon features in QGIS?

I installed the Freehand Editing plugin but it doesn't seem to work with the latest version of QGIS; the icon appears on the Ditizing Toolbar but the icon is disabled. Is there any way to use a ...
2
votes
0answers
370 views

How can I optimize ArcMap Editor's streaming mode for use with a tablet such as the Wacom Intuos?

I have the Wacom Intuos 4 Large tablet which I use occasionally outside of ArcGIS. I now need to digitize a large volume of polygons from aerial imagery and am finding the tablet's ArcGIS ...
1
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2answers
60 views

Which value should I assign my digitalized features?

I have a scanned an old document that contains geochemical interpolated values (no way to work with the digital file). This is the original image: And this is the digitalization I made from it: Now, ...
1
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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
1k views

“add feature” tool QGIS 2.0 - polygon fill blocks view of what I want to digitize

How can I change the settings on the vector "add feature" tool so the tool fill doesn't block my view of what I want to digitize? This problem popped up after I upgraded to QGIS 2.0 QGIS 2.0 Macbook ...
2
votes
1answer
413 views

Heads up digitizing - Polygons overlay differently with two different Satellite images

I have been digitizing building footprints from satellite image using ArcGIS 10.1 . Field data collections is done with the use of four corner point GPS way point. Due to multipath errors, we are ...
8
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2answers
19k views

Showing polyline direction in ArcGIS for Desktop (ArcMap)?

How can I show the direction of a polyline as it was digitised? I need this to check if my network analysis is obeying one way streets. I know of a tool in Xtools that can do this but my trial ...
1
vote
0answers
97 views

When digitizing, polygons are inverted

I need to use QGIS to digitize my images. My images are scanning electron microscope (SEM) images of rocks. I am interested in analyzing the pore space in the images. Here is the steps I follow: I ...
0
votes
1answer
107 views

Line style width property not being applied in QGIS 2.0.1

I change the line width of my style and click apply, but the property does not seem to be applying to my line data.
3
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4answers
6k 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 ...
0
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2answers
260 views

Which one is best open source GIS software where we can use Google/bing/yahoo maps as a basemap? [closed]

Which one is best open source GIS software where we can use Google/bing/yahoo maps as a basemap? i want to update my shp files using any of these basemap.
1
vote
3answers
501 views

How can I create a simple basemap in QGIS that will allow me to trace a polygon with an accurate projection?

I need to find an aerial photograph, create a new vector layer, trace several fields in this aerial photograph, and find random coordinates within these polygons. I first tried this with the Google ...
1
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0answers
46 views

Searching 'select by color' for raster or map data [duplicate]

I'm planing to create an online map component with which the user can create/draw polygons based on underlying raster data. Is there some library / tool / procedure existing which enables the ...
14
votes
4answers
18k 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 ?
1
vote
1answer
1k views

Create new regions in layer by filling in between polylines on existing layer

I'm not sure if this is possible but would save me hours of work. I have a layer which consists of polylines. Most of those polylines bound areas; houses, roads, etc. Currently I am required to ...
0
votes
1answer
159 views

Draw lines for existing list of data

I have a csv file containing information for loads of lines (dates, road names, condition information, etc etc) but which have no geographical information (other than the association of road name) Is ...
2
votes
1answer
803 views

using the “freehand” construction tool

I am drawing hydro features with the freehand tool. Does anyone know how to delete vertices (i.e. back up) in ArcMap 10 while drawing with freehand in the construction tools? I was just curious if ...
2
votes
2answers
454 views

Digitized Shapefile manually using wrong projection: how to fix it?

I have a raster in correct projection. I used shapefiles, and marked objects (manually), but I found out that my vector layers have different projection, so they have different size and position. Is ...
5
votes
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 ...
5
votes
2answers
340 views

Any Piri Reis shapefiles?

Incredible claims have been made about a map named after its creator (Piri Reis). I was looking into digitizing the map and overlaying it with a modern map of the world, specifically the east coast ...
-3
votes
1answer
1k views

How to digitize a map in QGIS? [closed]

I am relatively new to QGIS and using it on windows vista. Problem: I have to digitalise an aerial map and then extract the coordinates. I have absolutely no idea how to start Thanking you in ...
1
vote
1answer
140 views

Digitized vectors don't match while zooming [duplicate]

I'm trying to digitize in QGIS with Google Maps as the background. Digitizing with constant zoom works fine. But if the zoom is changed, the digitized vectors don't match the Google Maps background ...
1
vote
2answers
212 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 ...
3
votes
2answers
312 views

I am unable to draw a shape layer

When I add a new shape layer or want to edit an existing one, nothing is happening. I even don't see the dots where I'm clicking. Maybe the problem is I deleted some layers (by opening the .qgs as a ...
1
vote
0answers
79 views

When digitizing, objects are not saved well

I've some problems with digitizing. If I draw a line or a polygon, the line or polygon is saved in the attribute list, but not visible and its location is not saved either (when I zoom to the object ...
0
votes
2answers
3k views

Digitizing from OpenLayers Plugin in QGIS, or create raster?

Is there an easy method for digitizing from a layer added from the OpenLayers pluggin. As i cannot snap to it or use it as raster so the entire map does not load? two separate issues there.
3
votes
1answer
652 views

digitizing (tolerence) error in line data

I have designed a large number of boundaries. For accuracy, I took lines in patches from different data sets and merged them into one. Now I want to turn them into polygons from lines. I every second ...
8
votes
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 ...
11
votes
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 ...
33
votes
2answers
65k 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 ...
3
votes
0answers
363 views

How to digitize 90 degree angles? [duplicate]

Possible Duplicate: How to create polygons with straight lines and right angles in QGIS? In QGIS 1.8 is there a way to digitize buildings etc. with perfect 90-degree angles, Or, edit a polygon ...
2
votes
1answer
6k views

When I finish drawing a polygon, it disappears again (although appearing in my attribute table)

I'm working with Quantum GIS at this moment. And as the title says, when I finish drawing a polygon, it disappears again. The new object does appear in my attribute table and in the legend/'filling of ...
2
votes
2answers
955 views

Harvest data from an ArcGIS Server

I would like to include some state agency data in an application I am creating. The agency will not share the data so I have to find another approach. What I am interested in are the points on the ...
9
votes
3answers
777 views

How to outsource scanning and georeferencing maps?

We have some historical paper maps and we want to get them scanned and geo-referenced and ultimately make a seamless map for a particular time. What vendors supply this service? (I have found ...
1
vote
3answers
3k 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 ...
3
votes
3answers
3k views

How to digitize polygons from georeferenced raster file

I used QGIS to georeference a raster file of a custom US map. The map has features which are not strictly defined by state borders. I would like to digitize the map by creating contiguous borders for ...
5
votes
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 ...
2
votes
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, ...
6
votes
2answers
9k views

snapping polygons and lines [duplicate]

I recently downloaded QGIS on a Mac OSX 10.7.4 (lion) and purchased a master map shape file, of a particular area. I am trying to divide it into polygons following features on the master map vector ...
3
votes
1answer
406 views

Keeping streaming on in ArcMap when switching editing tools?

I have this problem constantly, because I digitize for work. No one there has figured this out and I was wondering if someone can tell me how to do this, because I'm tired of constantly hitting F8 and ...
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-...
7
votes
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 ...
37
votes
7answers
41k 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 ...