Hi,
For making it robust OJ could check histogram of the floating point raster and
warn user with a possibility to cancel. This is for sure slow, but users may
have floating point rasters with limited number of distinct values.
-Jukka Rahkonen-
Lähettäjä: michael michaud via Jump-pilot-devel
<jump-pilot-devel@lists.sourceforge.net>
Lähetetty: tiistai 10. marraskuuta 2020 22.21
Vastaanottaja: jump-pilot-devel@lists.sourceforge.net
Kopio: michael michaud <micha...@users.sourceforge.net>
Aihe: [JPP-Devel] [jump-pilot:bugs] Re: #510 Create Polygon From a Raster bug
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Hi Peppe,
Thank you for the detailed answer.
Indeed, I was not trying to do something useful, just checking if I did not
introduce a new bug in RasterImageLayer.
I perfectly understand that applying this tool to a raster containing floating
point values is not the normal use case. With such images, it would probably
need an additional parameter to define intervals and include all pixels
belonging to a same interval in the same polygon.
I just would like to avoid IndexArrayOutOfBoundException. There are probably
many options : deactivate plugin for this kind of image, intercept the
exception to provide a more informative message, try to make the plugin more
robust, map the floating point values to a reasonable set of integer values...
Let's try to choose something easy so that we can release 1.16 soon.
Anyway, your explanations about the two options will surely interest everyone
trying to do something useful with this plugin. Can it be retrieved from the
wiki ?
Michaël
envoyé : 10 novembre 2020 à 15:16
de : Giuseppe Aruta
<ma15...@users.sourceforge.net<mailto:ma15...@users.sourceforge.net>>
à : "[jump-pilot:bugs] "
<5...@bugs.jump-pilot.p.re.sourceforge.net<mailto:5...@bugs.jump-pilot.p.re.sourceforge.net>>
objet : [jump-pilot:bugs] #510 Create Polygon From a Raster bug
Hi Michael,
...even the time to vectorialize a raster with continuous data like DTM084 is
incredibly long...
In theory in mostly case an user chooses one of Raster->Vector tool according
to the type of the raster she/he wants to convert:
a) a continuous raster like a DTM. Data are scattered in a continuous interval
descibing a measure that gradually changes, for instance the elevation or a map
of temperatures. An user wonts to convert into a contour lines (Raster to
contours) or trasform into a discrete raster (eg. defining intervals of the
measure: 10-30% slope, 31-50% slope and so on
a) a discrete raster can be converted to a polygon layer (the case of Raster to
Polygons. See file UsoSuolo.tif by Roberto: each number with 3 digits (512,
111, etc) define a unique usage of the soil (forsets, cultivar, urban, etc).
There is neither no uniform measurement (a forest is different from a city) nor
a continuous gradually change (after 111 there would be a 231 in the scale, for
instance): we use number because we get advance (and the limit) that the Z
value of a raster accept only a number (float, double, integer or whatever, but
only a number not a string).
Of coarse, if we consider the limit of the interval and the cell size, all the
raster are tecnically discrete (each output polygon can have a size of the cell
size: see Stefan's tools, create a grid of points/of polygons).
When I added this plugin to OpenJUMP I wanted to bypass in one time two
problems:
a) Sextante Raster to Vector tool on discrete raster sometimes was giving wierd
results: island of no data where it was supposed to have valid data
b) the version of Raster to Polygon tool in OpenKLEM, derived from AdbToolbox
software, was taking a longer time and giving sometimes a strange outputs (like
sometimes self intersection polygons).
This plugin seems to solve both situations. OpenKLEM now refers to
VectorizeAlgorithm class, part AdbToolbox. While embedded OpenJUMP plugin can
use both algorithm. They both work, except if user wants to convert a
continuous raster to polygons with AdbToolbox.
I will give a look and atry to correct or to add some type of check, studing a
way to distinguish in OpenJUMP a continuous vs discrete raster, not sure if it
possible (an histogram is required and OJ raster histogram plugin can take a
very long time according the intervals.
Best regards
Peppe
________________________________
[bugs:#510]<https://sourceforge.net/p/jump-pilot/bugs/510/> Create Polygon From
a Raster bug
Status: open
Milestone: OJ_1.16
Created: Tue Nov 10, 2020 12:59 PM UTC by michael michaud
Last Updated: Tue Nov 10, 2020 12:59 PM UTC
Owner: nobody
The plugin has two modes : AdbToolbox and Sextante. With tiff images of type
float like DTM084 from Roberto Rossi, I can vectorize with Sextante, but Adb
throws en exception :
java.lang.ArrayIndexOutOfBoundsException: Index -9999 out of bounds for length
1925123
at
org.openjump.core.rasterimage.algorithms.VectorizeAlgorithm.toPolygonsAdbToolBox(VectorizeAlgorithm.java:113)
at
org.openjump.core.ui.plugin.raster.VectorizeToPolygonsPlugIn.run(VectorizeToPolygonsPlugIn.java:170)
at
com.vividsolutions.jump.workbench.ui.task.TaskMonitorManager$TaskWrapper.run(TaskMonitorManager.java:151)
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________________________________
[bugs:#510]<https://sourceforge.net/p/jump-pilot/bugs/510/> Create Polygon From
a Raster bug
Status: open
Milestone: OJ_1.16
Created: Tue Nov 10, 2020 12:59 PM UTC by michael michaud
Last Updated: Tue Nov 10, 2020 02:16 PM UTC
Owner: nobody
The plugin has two modes : AdbToolbox and Sextante. With tiff images of type
float like DTM084 from Roberto Rossi, I can vectorize with Sextante, but Adb
throws en exception :
java.lang.ArrayIndexOutOfBoundsException: Index -9999 out of bounds for length
1925123
at
org.openjump.core.rasterimage.algorithms.VectorizeAlgorithm.toPolygonsAdbToolBox(VectorizeAlgorithm.java:113)
at
org.openjump.core.ui.plugin.raster.VectorizeToPolygonsPlugIn.run(VectorizeToPolygonsPlugIn.java:170)
at
com.vividsolutions.jump.workbench.ui.task.TaskMonitorManager$TaskWrapper.run(TaskMonitorManager.java:151)
________________________________
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---
** [bugs:#510] Create Polygon From a Raster bug**
**Status:** open
**Milestone:** OJ_1.16
**Created:** Tue Nov 10, 2020 12:59 PM UTC by michael michaud
**Last Updated:** Tue Nov 10, 2020 02:16 PM UTC
**Owner:** nobody
The plugin has two modes : AdbToolbox and Sextante. With tiff images of type
float like DTM084 from Roberto Rossi, I can vectorize with Sextante, but Adb
throws en exception :
java.lang.ArrayIndexOutOfBoundsException: Index -9999 out of bounds for length
1925123
at
org.openjump.core.rasterimage.algorithms.VectorizeAlgorithm.toPolygonsAdbToolBox(VectorizeAlgorithm.java:113)
at
org.openjump.core.ui.plugin.raster.VectorizeToPolygonsPlugIn.run(VectorizeToPolygonsPlugIn.java:170)
at
com.vividsolutions.jump.workbench.ui.task.TaskMonitorManager$TaskWrapper.run(TaskMonitorManager.java:151)
---
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