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Jakub Sisak, GISP


May
5
comment Methodology for creating accurate drainage networks (and catchments) from high resolution LiDAR DEM?
Jacques; what a relief. I am not crazy after all. Can you please make your comment an answer and provide more detail (source of that claim?) There is a paper by Xiaoye Liu and Zhenyu Zhang from the Monash University in Australia who were apparently able to use LiDAR for similar analysis. I tried to contact them by have not received an answer yet. onlinelibrary.wiley.com/doi/10.1111/j.1475-4762.2010.00955.x/…
May
5
comment Methodology for creating accurate drainage networks (and catchments) from high resolution LiDAR DEM?
Mike. Thanks. I don't think the problem is complex. I have the same issue with every LiDAR dataset I work with. This is actually already a very small subset and i've tried many times - never being able to create a continuous detailed stream network. Using an interger raster works for very small scale models where accuracy is not paramount. This time i really need a "detailed local" drainage model. I think I might have to have a total station survey done instead.
May
5
comment Methodology for creating accurate drainage networks (and catchments) from high resolution LiDAR DEM?
Bill, sure no problem. I was just hoping for more input by narrowing down the issue. BTW, congratulations on becoming the moderator. The issue with using FP raster is that the resulting stream network is too disconnected, clustered, with too many orphan streams. (see the FA raster above)
May
4
asked Watershed / drainage network analysis; floating point or integer raster for input?
May
4
comment Methodology for creating accurate drainage networks (and catchments) from high resolution LiDAR DEM?
Anyone? I think it's boiling down to whether it is even possible to create a detailed drainage/watershed model from a floating point raster.
May
3
comment Methodology for creating accurate drainage networks (and catchments) from high resolution LiDAR DEM?
Yes it's bare earth. The terrain is rough but there might be some remnants of low shrubbery and such. The problem is that i was never able to do this correctly at this scale on any of the 4 LiDAR datasets i worked with. All from different source all 1m resolution.
May
3
revised Methodology for creating accurate drainage networks (and catchments) from high resolution LiDAR DEM?
added 610 characters in body; edited tags; edited tags
May
3
comment Methodology for creating accurate drainage networks (and catchments) from high resolution LiDAR DEM?
Right. I should have mentioned that. The hillshade is derived from the same grid. (And the black stream network is a Stream order (Strahler) derived from the Stream Link raster) Everything on this map except for the location of the stream (blue) is generated from the same grid.
May
3
asked Methodology for creating accurate drainage networks (and catchments) from high resolution LiDAR DEM?
May
2
answered Workflow for determining stream gradient?
Apr
28
answered Extensions Real World Examples
Apr
28
answered ArcGIS 10 - How can you open geodatabase files using a Browse Dialog Command (VB.NET/C#)?
Apr
28
comment Getting started with Arcobjects
Yes I am partial to VB. If I was a developer and used various platforms I would for sure go with C# but I find (and so is the popular opinion) VB clearer visually and easier comprehend and as a result better suited for a beginner.
Apr
27
answered Getting started with Arcobjects
Apr
27
comment How to position contour labels in Maplex above the line?
Thanks Jon. I commented on your post there. Take a look: forums.arcgis.com/threads/… Basically the offset itself I would like is already an attempt at a workaround. Ideally dynamic label mask (a true mask not a halo) would be the ideal solution.
Apr
26
comment Is it possible to export dynamic labels from ArcMap to KMZ? (Or alternate approach)
I see. The author sent me the link: resources.arcgis.com/gallery/file/geoprocessing/… Looks like it's written in VB6 hence the complex procedure. I will contact Kevin to see if it can be converted to an ArcGIS10 Add-in.
Apr
26
revised Is it possible to export dynamic labels from ArcMap to KMZ? (Or alternate approach)
added 89 characters in body
Apr
26
revised Is it possible to export dynamic labels from ArcMap to KMZ? (Or alternate approach)
added 344 characters in body
Apr
26
comment Is it possible to export dynamic labels from ArcMap to KMZ? (Or alternate approach)
Looked promising at first, but...Dynamic labeling is not supported. (Only as kind of a mouse over in Google Earth it seems) I was only able to successfully export one simple layer that contained my dynamic labels. Exporting several layers and a separate annotation layer raises a "mismatched tag" error in Google Earth and does not work at all. (There are very simple vector layers with less then 200 features in total)
Apr
26
comment Is it possible to export dynamic labels from ArcMap to KMZ? (Or alternate approach)
...Export to KML is an extension developed for ArcGIS 9.x...