photo

Wolfgang Schwanghart


Last seen: 8 Tage vor |  Aktiv seit 2007

Followers: 3   Following: 0

Nachricht

Professional Interests: GIS, Physical Geography, Hydrology, Geomorphology

Statistik

All
  • Knowledgeable Level 3
  • 6 Month Streak
  • Promoter
  • Quiz Master
  • GitHub Submissions Level 3
  • Personal Best Downloads Level 4
  • Editor's Pick
  • First Review
  • 5-Star Galaxy Level 5
  • First Submission
  • Thankful Level 1
  • First Answer

Abzeichen anzeigen

Feeds

Anzeigen nach

Frage


Does imread read subsets from cloud-optimized geotiffs
Hi, cloud-optimized geotiff (COG) is a format to work with spatial raster data in the cloud (https://www.cogeo.org/). I am curr...

mehr als 2 Jahre vor | 1 Antwort | 0

1

Antwort

Beantwortet
Plot line with points at given distance
Since you are working with TopoToolbox, you might want to use the function getlocation. If you have a STREAMobj S, then you can ...

fast 3 Jahre vor | 0

| akzeptiert

Beantwortet
Inverse distance weighting based on direction
Hi Christian, interesting question. First of all, if you follow the IDW-approach, you might save a lot of computing time using ...

fast 3 Jahre vor | 0

| akzeptiert

Frage


Fit Gaussian mixture model with weighted observations
Hi everyone, looking at the help of fitgmdist, I cannot see that there is the possibility to weight observations. Is there a rea...

etwa 5 Jahre vor | 3 Antworten | 0

3

Antworten

Beantwortet
2D gaussian filter with a variable sigma
Hi Chad, below is some code that does the trick using nlfilter. To be more efficient, I created a look-up table with a finite s...

mehr als 5 Jahre vor | 0

Beantwortet
What makes a Toolbox a Toolbox, and how is it recognized by Matlab?
Hi Chad, the trick is to have a Contents.m-file in the main folder of your toolbox. In TopoToolbox, the file starts with T...

mehr als 6 Jahre vor | 0

Frage


Customized icons in workspace
Hi all, I have written a couple of MATLAB classes and, as icing on the cake, I'd like to have customized icons in the worksp...

fast 11 Jahre vor | 0 Antworten | 1

0

Antworten

Beantwortet
total number of elements which are not zero
Hi, what about: B = sum(Percey~=0,2); Regards, W.

mehr als 12 Jahre vor | 0

| akzeptiert

Beantwortet
How can I perform a comparison function (of surrounding pixels) on a DEM using a starting pixel?
Hi, you might be interested in using the function ixneighbors available on the FEX which might make life a little easier for ...

mehr als 12 Jahre vor | 0

Beantwortet
Connected graph given adjacency matrix
You can use the function dmperm to see if a graph consists of one or several connected components. E.g. see the example here <h...

mehr als 12 Jahre vor | 0

| akzeptiert

Beantwortet
path elevation profile
Hi, if you have the image processing toolbox, the function improfile should do what you ask for. <http://www.mathworks.de/help/...

fast 13 Jahre vor | 0

Beantwortet
image toolbox help
type doc images in the command window.

etwa 13 Jahre vor | 0

Beantwortet
plotting more data from large data
Hi doc gscatter hope this helps. Regards, W.

etwa 13 Jahre vor | 0

Beantwortet
What does +(A>0) do?
I often do this to convert a logical matrix to double. However, I just tried and realized that this is slower than A = double(A>...

etwa 13 Jahre vor | 1

Beantwortet
error using imsubtract
Hi Megah, apparently both variables don't have the same class. Try image3 = imsubtract(im2double(image1),im2double(BWfinal)...

mehr als 13 Jahre vor | 0

Beantwortet
Calculate the indirect distance between two points
Bahare, you might find this contribution interesting: <http://www.mathworks.com/matlabcentral/fileexchange/8625-shortest-pat...

mehr als 13 Jahre vor | 0

Beantwortet
Ordered connected components
Hi Dustin, I don't have MATLAB at hand right now, so I cannot try, but I think bwboundaries should solve your problem. [...

mehr als 13 Jahre vor | 0

Beantwortet
Graph analysis question
I just tried your example. While results of a kmeans clustering don't look too promising, the function clusterdata works quite w...

mehr als 13 Jahre vor | 0

Beantwortet
Overlay digital elevation model on hillshade
Hi Ajay, you might want to check TopoToolbox, which includes such a function. <http://physiogeo.unibas.ch/topotoolbox/> ...

mehr als 13 Jahre vor | 0

Beantwortet
Count black and white pixels on a image
How about using *blockproc* to get the number of white pixels (in case you have the image processing toolbox)? A = full(spran...

mehr als 13 Jahre vor | 1

Frage


Keeping k largest values in each column of a sparse matrix
Hi everyone, I am trying to implement an algorithm that involves a pruning of a large sparse matrix. The pruning scheme shoul...

mehr als 13 Jahre vor | 1 Antwort | 0

1

Antwort

Beantwortet
data correction
Hi, you can identify the NaNs using the function isnan. I = isnan(dem); % where dem is the digital elevation model The inpa...

mehr als 13 Jahre vor | 0

Beantwortet
Problem on fuzzy inference calculations ..
Hi, the error message says all: The first input must be a defined DOUBLE matrix Is the variable input in double format? ...

mehr als 13 Jahre vor | 1

| akzeptiert

Beantwortet
finding neighbor of a position
Hi, you might find this function useful. <http://www.mathworks.com/matlabcentral/fileexchange/16991-neighbor-indexing> ...

mehr als 13 Jahre vor | 1

Beantwortet
Connect bwlabeled components
I'd start with using the function bwlabeln to label the connected components in the 3d. This, however, requires them to never ov...

mehr als 13 Jahre vor | 0

Beantwortet
straighten curved Image
This is not trivial and I think you should show what you have done so far. If you haven't really started yet, you may want to lo...

mehr als 13 Jahre vor | 0

Beantwortet
correlation coefficient
Hi, doc corrcoef Best regards, W.

mehr als 13 Jahre vor | 1

| akzeptiert

Beantwortet
how to draw a grid in MATLAB???
Hi, take a look at Steve's blog, where he describes how to generate a pixel grid. Perhaps, this is what you want. <http://...

mehr als 13 Jahre vor | 1

Beantwortet
Kriging
To my knowlegde there is no comprehensive geostatistical software written in Matlab. I would always use packages such gstat or g...

mehr als 13 Jahre vor | 2

Beantwortet
How to plot a 2D vector-field and exclude zero-vectors (dots) in the graph?
How about: I = ~(T(:,3)==0 & T(:,4)==0); quiver(T(I,1),T(I,2),T(I,3),T(I,4)); cheers, Wolfgang

mehr als 13 Jahre vor | 2

| akzeptiert

Mehr laden