kandi X-RAY | DSM Summary
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QUESTION
I have a question regarding to the TIN method used in LidR. My point cloud data is look like this figure. When I compute DSM using TIN method, the height value is not at the highest peak of first return. Does the value used in triangulation is an average value from several first return within one pixel? Is there any ways to retrieve the DSM from the highest first return using LidR or another software? Thank you.
- Michael -
I am expecting to retrieve clarification about the TIN algorithm used to generate DSM in LidR package.
...ANSWER
Answered 2022-Mar-30 at 23:41lidR triangulates the first returns and interpolates at the location of the centers of the pixels. So if a pixel is at the center of a triangle the value it returns is a linear combination of the elevation of the 3 points of the corresponding triangle. In your example the pixels look very big. Consequently the center of the pixel is somewhere in one of the many triangles encompassed by the pixel. It'd say it is relatively meaningless to compute a triangulation-based CHM with a resolution much larger than the average point spacing.
If you want to make a CHM that correspond to the highest point use a point-to-raster based method i.e. p2r().
QUESTION
I want to run llvm-slicer (source) for PostgreSQL main executable file (i.e., PG_ROOT/src/backend/postgres) to carry backward slicing on PostgreSQL.
llvm-slicer runs on top of bitcode (.bc file). I have compiled PostgreSQL via ./configure CC=clang-6.0 && make CC=clang-6.0, duiring which, the final compile command that link many .o files together is (very long):
ANSWER
Answered 2022-Mar-22 at 08:54Solution: whole-program-llvm.
It provides tools for building whole-program (or whole-library) LLVM bitcode files from an unmodified C or C++ source package. It currently runs on *nix platforms such as Linux, FreeBSD, and Mac OS X.
QUESTION
when i try to center my links they just align left. ive has this problem twice and i cant find anything that works for me. when i use flex the buttons are stretched across the div, so i adjust the width to fit content and they align left. how do i center the links? (the links that i gave the button class) (im still new to web development, sorry)
...ANSWER
Answered 2022-Mar-21 at 16:08All you needed at this point is to add align-items:center; to .buttons and it would work, like so:
QUESTION
I am trying to use OpenVPN on my Synology NAS. I configure everything I need and then when I try to export configuration files, the openvpn.zip file that contains only 2 files (README.txt and openvpn.ovpn), the ca.crt file is not included.
Thus, I can't do anything. Would you have any idea about how to correct this unfortunate state?
I have recently updated to DSM 7
VPN Server 1.4.4-2855 after DSM update uninstalled and installed and configured again. Several reboots. Nothing worked for me.
Exported ZIP file contains only Readme.txt and openVPN.opvn.
Thank you for your help!
...ANSWER
Answered 2022-Mar-16 at 17:20The zip-File contains 2 files:
QUESTION
I am currently working on the following:
I have two dataframes. One dataframe contains a number of inventors per company and I would like to know how often their name appears in another dataframe in the same company.The company identifier (df_itemnumber_rounded) in both dataframes is called the same and present in both dataframes.
Example:
First dataframe includes:
...ANSWER
Answered 2022-Feb-10 at 21:41Here's a potential solution. Note that your assignee and citetp variables are messy with whitespaces at the beginning/end taht you might not want to take into account for your string search:
library(tidyverse)
QUESTION
I tried to set up importXML in my Google Sheets, I used the method to copy full Xpath. It seems not working at all. After reading Xpath still not sure how to get the right path just for the token price. Hope can get some idea or document to read to get the value I need. Thanks a lot for reading this. Wish you to have a nice day.
=IMPORTXML("https://info.osmosis.zone/token/DSM","/html/body/div[1]/div/div[3]/div/div/p")
...ANSWER
Answered 2022-Jan-17 at 12:52The page contents
You need to enable JavaScript to run this app.
JavaScript content is not supported by any IMPORT formulae. the best course of action would be to find a different source for your scrapping.
You need to use a specific url (api) which contains the json.
edit :According to the url provided by @QHarr and if you want to retrieve all informations from url, try
QUESTION
I have been using a fatal_handler() function that I expanded on for over a year now but for some reason I now have random errors popping up in the error_log file on the server and triggering the notification. Previous to a little while ago it was working fine.
The errors seem to come from the array $error which is suppose to be set by error_get_last(). With that, I am even unsure why the error event is firing. Any of my logs that the function creates are empty. It doesn't give me any specific page causing the error, just the function itself.
The $notice->rMsg saves the notification in a session variable and then displays anything in that session variable the next page load. Sometime I have 10 or 20 of these notifications popping up when I shouldn't. The page still loads, I am not redirected to the system logs, and I can continue on but the errors still keep coming. I do not know what is wrong but hopefully someone can point me in the right direction to look.
...ANSWER
Answered 2022-Jan-09 at 21:38As the name suggests, register_shutdown_function registers a handler to run every time PHP "shuts down" - that is, at the end of every request, regardless of whether it's ending "normally" or after an error.
It's therefore up to you, inside the handler function, to detect whether the shutdown was due to a fatal error or not. The common trick with this is to look at the last "error", which might better be termed "diagnostic", because it includes Warnings, Notices, and Deprecation messages. If there was a fatal error, we can expect it to be the last thing that happened before the shutdown handler is called, so if we immediately call error_get_last, we should get the information about it.
Let's trace through some key parts of your function:
QUESTION
Since TypeRegistry io.cucumber.core.api.TypeRegistry is @Deprecated I have troubles declaring my parameter annotations, I have now idea how to transform them to the @ParameterType
I tried this
...ANSWER
Answered 2022-Jan-07 at 07:56The fault is I put the @Parametertype("foo") above the step but thats not necessary and thus throwing the error. It works perfectly fine otherwise.
So this works:
QUESTION
I downloaded the terrain data from the site (example https://drive.google.com/file/d/1OiFy-vLq9CvVeqNg9VogmxSPOMcpcD1W/view?usp=sharing ) and got the data. Specifically interested in the format *_DCM.tif, which, as I understand it, stores data on point - longitude, latitude and altitude.
With gdal I can convert a file to .XYZ file and take the data, but the file size becomes too large.
In this regard, 2 questions:
- Is it possible to parse the tif file somehow and get this data?
- Is it possible to convert programmatically .tif in .XYZ and work with the received data?
Which libraries have I already reviewed:
https://github.com/chai2010/tiff/tree/master/examples
https://github.com/lukeroth/gdal/blob/master/examples/tiff/tiff.go
https://github.com/airbusgeo/godal/blob/main/doc_test.go
https://pkg.go.dev/github.com/rwcarlsen/goexif/exif
https://pkg.go.dev/github.com/evanoberholster/imagemeta
UPDATE:
I found the gdallocationinfo method. For example, I have converted all tiff files to VRT and am working with it: gdallocationinfo -xml -wgs84 dsm-mosaic.vrt 28.000139 50.999861
I need "Value" - altitude
But I couldn't find an implementation on Golang in any way. I also tried to rewrite the code in Python, but without success.
I was told that calling a console command from code is a bad idea.
If anyone knows how to get information on latitude and longitude, then I will be gdal :)
...ANSWER
Answered 2021-Dec-28 at 20:47The tiff package of the standard library can't handle the encoding used, it says that the SampleFormat that was uses is not supported: tiff: unsupported feature: sample format.
The github.com/chai2010/tiff library does the job. The example below decodes the image so we can loop over all of its pixels. The desired format uses GPS coordinates, so we have to do some conversion work, I hardcoded the offsets to keep the example concise, parsing them dynamically from the file name should not be difficult.
I am not 100% sure about the float64(x) / float64(bounds.Max.X)) part, since the values don't seem to match the screenshot you sent. Could be that some other scaling values should be used depending on the grid size, but I figure you can fix that yourself.
QUESTION
A little bit of background. I'm trying to make a model for clustering a Design Structure Matrix(DSM). I made a draft model and have a couple of questions. Most of them are not directly related to DSM per se.
...ANSWER
Answered 2021-Dec-14 at 23:17(Perhaps you would get more answers if you separate this into multiple questions.)
Question 3:
Here's an answer on the trace question:
When running the model, the trace actually shows this:
intraCost, extraCost
which is not what you expect, of course. Trace is in effect when creating the model, but at that stage there is no value of these two decision values and MiniZinc shows only the variable names. They got some values to show after the (first) solution is reached, and can then be shown in the output section.
trace is mostly used to see what's happening in loops where one can trace the (fixed) loop variables etc.
If you trace an array of decision variables then they will be represented in a different fashion, the array x will be shown as X_INTRODUCED_0_ etc.
And you can also use trace for domain reflection, e.g. using lb and ub to get the lower/upper value of the domain of a variable ("safe approximation of the bounds" as the documentation states it: https://www.minizinc.org/doc-2.5.5/en/predicates.html?highlight=ub_array). Here's an example which shows the domain of the intraCost variable:
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