AOI | c # AOI algorithm for cross linked list | Learning library
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c# AOI algorithm for cross linked list
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QUESTION
- Context: I work with satellite images that I filter to transform to arrays of 1s and 0s, based on the presence of snow (0 for snow, 1 for non-snow). My code creates an array of
NaNs, searches for each snow pixel if at least one of the neighbor is non-snow (in a cross patter, cells painted red in the picture below), and inputs "1" in thenanarray. Once I do that for my entire matrix I end up with lines where a line cell = 1, rest are nans. - Problem: I end up with a matrix with several lines inside. What I count as a line is at least two cell equal to 1, in the direct neighborhoods. Meaning that for each line cell, if any of the 8 surrounding cells has a
1inside, they are forming a line (figure below shows the boundary between snow (purple) and non-snow cells (yellow). - What I have: I wrote an algorithm that counts the amount of cells in a line and records its starting/ending cells (see figure below, amount of cells through which the red line passes) so I can filter my lines by size at the end.
- What I want: my code works but is extremely slow. I coded it the best way I could but O was wondering if there was a way to be more efficient ?
Ps: Sorry about the clanky explanation, it is hard for me to explain clearly. The code will show you how it works, and the figures generated should make it clearer.
Some code to generate a "lines" matrix:
...ANSWER
Answered 2022-Apr-16 at 01:45There's an idea in image processing, which is find to a group of pixels which is contiguous, or a connected component. Once you break the image up into connected components, you can find the size of each component, and filter out small ones.
There's a fast way of doing this in the scipy package, called scipy.ndimage.label which you could apply like this:
QUESTION
I am running a classification script in GEE and I have about 2100 training data since my AOI is a region in Italy and have many classes. I receive the following error while I try save my script:
Script error File too large (larger than 512KB).
I tried cancelling some of the training data and it saves. I thought there is no limit in GEE to choose training points. How can I know what is the limit so I adjust my training points or if there is a way to save the script without deleting any points. Here is the link to my code
...ANSWER
Answered 2022-Apr-01 at 22:30The Earth Engine Code Editor “drawing tools” are a convenient, but not very scalable, way to create geometry. The error you're getting is because “under the covers” they actually create additional code that is part of your script file. Not only is this fairly verbose (hence the error you received), it's not very efficient to run, either.
In order to use large training data sets, you will need to create your point data in another tool and upload it (using CSV or SHP files) to become one or more Earth Engine “table” assets, and use those from your script.
QUESTION
I have 2 dataframe whose sample is as below:
df1:
...ANSWER
Answered 2022-Mar-28 at 17:39Check with merge
QUESTION
I am having trouble getting raster data in R from the ArcGIS REST API. It is located at the endpoint https://maps.vcgi.vermont.gov/arcgis/rest/services/EGC_service/IMG_VCGI_LIDARNDSM_WM_CACHE_v1/ImageServer and I want to fetch just the data for my area of interest. I can successfully load the data in QGIS as a web coverage service using the url "https://maps.vcgi.vermont.gov/arcgis/services/EGC_services/IMG_VCGI_LIDARNDSM_WM_CACHE_v1/ImageServer/WCSServer", but want something I can turn into a raster layer or raster brick in R.
I would prefer a high-level method and have tried the arcpullr package, using an sf polygon object of my area of interest to define the bounding box (aoi in the code below, which is a simple feature collection with 1 feature and 1 field;
Bounding box: xmin: 499682.2 ymin: 208467.7 xmax: 503271.3 ymax: 212056.7;
Projected CRS: NAD83 / Vermont, 32145). This returns an empty raster brick (all values are NA) in the correct location:
ANSWER
Answered 2022-Feb-21 at 11:28The problem you are experiencing is that you are not using the right crs. You simply need to convert your aoi from EPSG: 32145 to EPSG: 3857 (the spatial projection information is provided on the Service webpage).
So, please find below a little reprex.
Reprex
- Code
QUESTION
I am capturing a URI in ASP.NET MVC with webcam.js. I would like to turn this URI to to bitmap in C#. Below is my current code for attempting to parse the URI into a bitmap, but it, but it gives error "Invalid length for a Base-64 char array or string" when creating the byte buffer. I've also tried pulling it in as a C# Uri type, but haven't had any luck.
ANSWER
Answered 2022-Feb-15 at 21:27Your regular expression is incorrect.
The base-64 data starts after base64, in the data URI. Note the comma. Your regular expression includes the comma in the data capture group. You need to put it outside the capture group:
QUESTION
I am trying to replace "#N/A" values with 0 in all attributes of xml.
Input xml:
...ANSWER
Answered 2022-Feb-14 at 19:25Use the script given below.
QUESTION
I have gaze-direction data in columns A_aoi and B_aoi as well as the respective gaze durations in columns A_dur and B_dur:
ANSWER
Answered 2021-Dec-28 at 11:48You can modify the calculate function to check for NA values.
QUESTION
I have data on gaze behavior during Question and Answer sequences; gazes are recorded for each speaker A, B, and C in columns A_aoi, B_aoi, and C_aoi, gaze durations are recorded in columns A_aoi_dur, B_aoi_dur, and C_aoi_dur:
ANSWER
Answered 2021-Dec-25 at 11:39Here is a try. I do not have any experience with 'gazes' etc...
It took me some time and some help (see here Conditionally take value from column1 if the column1 name == first(value) from column2 BY GROUP thanks to @tmfmnk.
I hope this potpourri of code may help. I left the code as it is because of sake of readability. I am sure one can fine tune it. Main parts of what I tried to do is in the blocks.
QUESTION
I have several ugly json strings like the following:
...ANSWER
Answered 2021-Dec-01 at 19:17The string looks like double-encoded json to me. This decodes it an writes a utf-8 json file.
QUESTION
I'd like to convert a sf object to a dataframe and restore it to its original state. But when I make the conversion of st_as_text(st_sfc(stands_sel$geometry)) is shows very difficult to retrieve it again. In my example:
ANSWER
Answered 2021-Oct-12 at 13:43I think geom isn't in a format st_geometry is expecting. st_as_text converted your geometry into WKT as discussed in the help:
The returned WKT representation of simple feature geometry conforms to the simple features access specification and extensions, known as EWKT, supported by PostGIS and other simple features implementations for addition of SRID to a WKT string.
https://r-spatial.github.io/sf/reference/st_as_text.html
Instead, use st_as_sf(wkt=) to set the new (old) geometry.
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