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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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3
votes
2answers
816 views

QGIS Freehand editing plug-in: blocked attribute table

I can't save object after drawing by Freehand editing plug-in. I suppose it will be connected with creating some (special) column in the table. Could anyone suggest a solution?
2
votes
2answers
680 views

How to automatically convert dots on paper maps to vector points?

I have several paper maps with dots that I need to convert to vector points. I was hoping to get some suggestions on how to accomplish this without recreating each and every point by hand. I know ...
5
votes
2answers
1k views

How to digitize rectangles with snapping in QGIS?

Trying to digitize a floor plan for a building (just need polygons for each room) in QGIS (shapefile layer). I started just trying to draw the features, but want to align polygons so that there is no ...
2
votes
2answers
373 views

ArcGIS lines to polygons without holes

I have a dataset with contours. Depression contours are separate of the normal contours and need to be digitized counter-clockwise. Still, there are usually some faulty ones with wrong direction and ...
6
votes
1answer
849 views

What is the fastest way to digitize features on a map?

I'm currently using QGIS basically to trace a bunch of polygons to show individual ponds from google maps. Some of the geometries can be pretty oddly shaped and using the nodal digitizing tool gets ...
2
votes
2answers
415 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 ...
2
votes
1answer
1k views

Why are my polygons automatically simplified/generalised when merging them in ArcMap 10.2?

I am creating a small land use map, as an exercise for visual image interpretation. I created a shapefile and started digitising polyogons with the polygon tool. The problem is that some of my ...
2
votes
1answer
215 views

Digitizing takes a long time [closed]

While in the process of digitizing for instance a large body of water or piece of land it takes a long time to process. Is this normal? If not what can I do to speed up the process.
3
votes
1answer
647 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 ...
4
votes
1answer
1k views

Digitizing contour lines from paper maps using QGIS?

Is it possible to give digitized altitude lines (from paper map) heights using QGIS?
1
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0answers
135 views

How to set a defined distance between nodes to digitize in qgis?

Using QGIS (by now I have the 2.4 version) I would like to set some parameter (I don't know if such exists) that would impose a definite or maximal distance between nodes when digitizing a polyline or ...
3
votes
1answer
1k views

How to find the projection of an image?

Instead of georeferencing the image and deforming it, I'm trying to find the projection used by the author of the image. I've got tens of these distribution maps to digitize. The idea is to avoid ...
9
votes
3answers
2k views

How can I digitize features on an Y,Z plane in ArcGIS?

How can I geo-reference and digitize features on a Y,Z plane of a vertical cross-section in ArcGIS? The surface coordinate system is NAD 83 UTM 15. This is a simplified version of the question found ...
0
votes
0answers
140 views

QGIS Fill Ring tool problem

Using the new (in 2.2) 'Fill Ring' tool and it doesn't seem to work correctly in all cases. It seems that if I try and digitise the new ring close to the polygon boundary, TWO (or more) geometries ...
2
votes
1answer
177 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 ...
2
votes
0answers
351 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
vote
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, ...
0
votes
1answer
104 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.
2
votes
1answer
404 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 ...
5
votes
2answers
574 views

ArcGIS Heads up digitizing - Rooms and doors

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 ...
1
vote
0answers
95 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 ...
2
votes
1answer
5k 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 ...
0
votes
2answers
256 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
476 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
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
158 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 ...
-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 ...
2
votes
1answer
748 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 ...
5
votes
2answers
317 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 ...
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 ...
9
votes
3answers
747 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 ...
3
votes
2answers
297 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
78 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.
6
votes
7answers
8k views

How can I digitize a PDF image?

I have an image file in pdf format which includes some drawings (lines, closed areas, and points). I want to digitize it into a shapefile so that I can show it on a Google map. I have a couple of ...
3
votes
0answers
323 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
2answers
870 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 ...
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 ...
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
3answers
1k views

How do I draw on a vector map in GRASS?

I have a vector map that has two lines. I want to have the two connected. Is there a way for me to draw a line to connect the two? I am using GRASS gis by the way. The two lines that I want to connect ...
15
votes
7answers
7k views

Is it easy to digitize in ArcGIS using the Wacom tablet?

I do just enough digitizing (and touching up/ drawing when post-processing) to perhaps warrant the purchase of a Wacom tablet. Just wondering how well it plays with ArcGIS. What are your experiences? ...
7
votes
1answer
1k views

GRASS - Will r.to.vect work on this scanned map?

Total GRASS noob here. I have several very large hand contoured maps to digitize, and this thread intrigues me. In the past I have spent hours upon hours digitizing these maps and revisions in ArcMap. ...
20
votes
6answers
527 views

The general public and their ability to use GIS applications - do we still need paper maps?

I am endeavouring to convince others in my organisation that GIS tools, in particular digitising tools, CAN be used by the general public and we should promote their use instead of using paper maps. ...