How can I convert a jpeg file to a shapefile? – ResearchGate

I have a map in .jpeg format. I want to get latitude and longitude of that. So, it is necessary to convert it into a shapefile. Hi. Converting raster map (jpeg) into vector layer is quite a problem (it takes time, unless it can be done automatically, but it is usualy not the case). But it seems it is not necessary in Your case. Just do the georeferencing of the raster map and You will be able to read the coordinates. If there are no points of known position (even cartographic grid will work if you know the projection) on the map (georeferencing is impossible in that case), find some already existing shapefile of the area (e.g. a coastline) and try to fit your raster map to the one you have found. Good luck. Hi. Converting raster map (jpeg) into vector layer is quite a problem (it takes time, unless it can be done automatically, but it is usualy not the case). But it seems it is not necessary in Your case. Just do the georeferencing of the raster map and You will be able to read the coordinates. If there are no points of known position (even cartographic grid will work if you know the projection) on the map (georeferencing is impossible in that case), find some already existing shapefile of the area (e.g. a coastline) and try to fit your raster map to the one you have found. Good luck. in the case of using Arcmap (ArcGIS, Esri) you should make georefrencing to the map (see this link: https://www.youtube.com/watch?v=PHtxbpboDro ). next step you should create a feature class and make digitization over the map ( see this link: https://www.youtube.com/watch?v=FgBx9T8GrcY ) Much depends on the type of image. If they are linear traces maybe you can use an automatic vectorizer . An example is the link that I put to you. But the most common is georeferenced and then vectorized manually. In what image is it? 1. Get Lat Long: JPEG does not directly carry geo information. If you got from other source there may be JPW file giving the necessary information which most of the GIS software read. Otherwise you need to georeference the file with available masters. 2. Vectors : Use GDAL polygonize if you want to understand and control the parameters. For direct use, QGIS is the best option with polygonize plugin. In ArcGIS this is done via the Georeferencing Toolbar, which is turned off by default. To turn it on you just right-click on a toolbar, look for Georeferencing and turn it on. Then you will use the 'Add control points' tool (first button after right of the combo box) to tell arcgis what points on the image correspond to points on a second data source that already has a spatial reference. If you have Google Earth you can select the area that you are interested in and export it in the UTM that you need. Hi all. Geoda spatial analysis software (https://geodacenter.asu.edu/software/downloads) has a tool for converting raster images to .shp file formats. You can georeference it using georeference tools in ARCMAP. For this you can use GCPs coordinates which you can obtain them by GPS or from pre-known points. For this, you will use at least points if your image is related to a flat region, 7 points if you are in a semi-flat region and 11 points for tose regions are variable in topography. First you have to understand differences between raster and vector models in GIS. JPG is picture file format (raster without any georeference information) and shapefile is ESRI`s vector map file format. Shapefile vector maps can have three different kind of forms (points, lines and polygons). First you have to decide which of these three forms suites to information in your jpg-image. Then you should do georeferencing and geocorrection for your jpg-image. After that you have to digitize your information for vector format. Source.


Яндекс.Метрика Рейтинг@Mail.ru Free Web Counter
page counter
Last Modified: March 26, 2014 @ 12:00 am