spex | Spatial extent tools | Data Visualization library
kandi X-RAY | spex Summary
kandi X-RAY | spex Summary
Spex provides a small set of functions for working with spatial data. These are. Create a fully-fledged SpatialPolygonsDataFrame extent from any object understood by the ‘raster’ package function ‘extent()’. If the input has projection metadata it will be carried through to the output. The intention is to support any object from packages sp, raster and sf. If you want this to work on other types, create an issue and get in touch to discuss!. The polygonization approach is faster than rasterToPolygons, and multi-layer rasters are converted to multi-column spatial data frames. This only does the pixel-to-polygon case. It provides an sf POLYGON data frame, but there is a version qm_rasterToPolygons_sp that returns a Spatial version. The “buffered extent” is used to create cleanly aligned extents, useful for generating exacting grid structures as raster or vector.
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spex Examples and Code Snippets
Lines of Code : 90
License : No License
Copylibrary(spex)
library(raster)
#> Loading required package: sp
data(lux)
(exlux <- spex(lux))
#> class : SpatialPolygonsDataFrame
#> features : 1
#> extent : 5.74414, 6.528252, 49.44781, 50.18162 (xmin, xmax, ymin, ymax Community Discussions
Trending Discussions on spex
QUESTION
I am newbie and maybe this is silly question. I want to activate tab by clicking on pushButton . If I click pushButton_1 then it shows/activates tab_1, on the clicking pushButton_2 switches to tab_2, and so on . Bellow there is pic how I tried it but without success. Help me solve this and write correct code down. Thank you in advance.
This is my code :
...ANSWER
Answered 2020-Aug-04 at 11:06The simplist solution would be to connect your buttons to a function that changes the tab index on click
QUESTION
The documentation here clearly outlines that it is a bad practice to write
...ANSWER
Answered 2020-Mar-01 at 07:50The coming of ES7 with async/await to the scene, dissipated the need for putting queries in a batch.
You can simply do this instead:
QUESTION
I need to make a query with pg-promise using the result to make 3 others queries but i am getting this error when executing:
Unhandled rejection TypeError: Method 'batch' requires an array of values. at batch (C:\apps\pfc\node_modules\spex\lib\ext\batch.js:61:26) at C:\apps\pfc\node_modules\spex\lib\ext\batch.js:149:26 at Task.batch (C:\apps\pfc\node_modules\pg-promise\lib\task.js:120:39)..............
This is my code:
...ANSWER
Answered 2019-Jul-28 at 10:25I'm the author of pg-promise.
There are several problems with your code, as explained below...
Value-transformation callback that you use with method one is meant for transforming the returned value. And even though technically you can return a promise, which you do, this creates an awkward code, from the promises point of view. I would advice not to do it that way.
It is not a good solution putting non-database code inside database tasks, which creates mixed-purpose code that's way more difficult to maintain, and is also considered an anti-pattern.
And the very bug you are getting in the end is because you are doing
.thenon the result of the batch, which in your code will beundefined, passing it into another batch, which obviously doesn't like it and throws that very error. The thing is, you do not need it there at all. You must have copied if from the code where it was needed, and put it where it is not needed :)
Having said all that, here's what your code should look like:
QUESTION
I'm trying to get my code to go through a list of files and retrieve a piece of information from each. There are 618 .txt files in the list, and 606 of them contain the information I need. I need my code to check if each file contains the string "J magnitude" and if it does, retrieve the relevant value. If the string isn't there, I want the number -99.9 added instead so that my list is still 618 items long.
This is the code I have written so far:
...ANSWER
Answered 2019-Feb-21 at 15:10It looks like your if J magnitude" in f: check fails. Instead of checking that, try having a flag inside if "J magnitude" in line: that is True if you found "J magnitude" and then do mag = -99.9 if the flag is False.
QUESTION
I'm using pg-promise and I want to make massive inserts into a table using pgp.helpers. I've seen solution like Multi-row insert with pg-promise and also followed Data import for streams (Spex) but still it fails with the same error as in this post https://github.com/vitaly-t/spex/issues/8
I tried using a example from the other post on CSV stream(rs.csv()) but when i replaced the same with JSonStream parser I still get the same error.
Can you please share a working example?
db.tx(t => {
return streamRead.call(t, stream.pipe(parser), receiver)
})
ANSWER
Answered 2018-May-08 at 18:02There might be a better way to do it, but the below code sure works! I have the chunks(row.length) at 20,000 per insert statement you can adjust accordingly based on your needs.
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