earth | Fetch photo of the earth every 10 minutes
kandi X-RAY | earth Summary
kandi X-RAY | earth Summary
earth
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Top functions reviewed by kandi - BETA
- Synchronizes the content of the internet .
- Handle the scroll .
- Deletes an Earth .
- transfer the earth to the browser
- Initializes the activity binding .
- Handles download an asset .
- Initializes the EarthManager .
- Performs sync operation .
- Private helper method used to dispatch system insets
- Called when the app is updated .
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Community Discussions
Trending Discussions on earth
QUESTION
I am trying to render the world map with elevation data using D3.
For this I use Natural Earth 50m land geojson : https://github.com/martynafford/natural-earth-geojson/tree/master/50m/physical
And Natural Earth elevation raster data : https://www.naturalearthdata.com/downloads/50m-raster-data/50m-shaded-relief/
I am using this tutorial : https://datawanderings.com/2020/08/08/raster-backgrounds/
So I first found the bounds of the geojson :
...ANSWER
Answered 2022-Mar-20 at 08:06A Mercator is usually clipped at roughly 85 degrees North/South (~85.05113 N/S) - as further than this you get a map that is taller than it is wide, and one that gets much much taller for every extra degree north/south included in the extent..
D3 clips features using this limit:
The spherical Mercator projection. Defines a default projection.clipExtent such that the world is projected to a square, clipped to approximately ±85° latitude.
The northern bounds are fine, but the southern bounds of the geojson is -89.998926 degrees which you use to cut the image. But as D3 clips the geojson, your stretching the image by a different amount as compared with the geojson, hence the issue you see.
The solution should be to clip the image to a bounds that is representative of the limits of what D3 will render for a Mercator (85.05113 degrees south) not the limits of the data itself.
I haven't looked up how faithfully gdal implements EPSG:3395 as the definition provides for a projected bounds of 80 degrees south and 84 degrees north - though looking at the image, this doesn't appear to be an issue.
You can also use the cleaner fitSize methods for D3 projections (d3v4+):
QUESTION
I was simulating the solar system (Sun, Earth and Moon). When I first started working on the project, I used the base units: meters for distance, seconds for time, and metres per second for velocity. Because I was dealing with the solar system, the numbers were pretty big, for example the distance between the Earth and Sun is 150·10⁹ m.
When I numerically integrated the system with scipy.solve_ivp, the results were completely wrong. Here is an example of Earth and Moon trajectories.
But then I got a suggestion from a friend that I should use standardised units: astronomical unit (AU) for distance and years for time. And the simulation started working flawlessly!
My question is: Why is this a generally valid advice for problems such as mine? (Mind that this is not about my specific problem which was already solved, but rather why the solution worked.)
...ANSWER
Answered 2021-Jul-25 at 07:42Most, if not all integration modules work best out of the box if:
- your dynamical variables have the same order of magnitude;
- that order of magnitude is 1;
- the smallest time scale of your dynamics also has the order of magnitude 1.
This typically fails for astronomical simulations where the orders of magnitude vary and values as well as time scales are often large in typical units.
The reason for the above behaviour of integrators is that they use step-size adaption, i.e., the integration step is adjusted to keep the estimated error at a defined level. The step-size adaption in turn is governed by a lot of parameters like absolute tolerance, relative tolerance, minimum time step, etc. You can usually tweak these parameters, but if you don’t, there need to be some default values and these default values are chosen with the above setup in mind.
DigressionYou might ask yourself: Can these parameters not be chosen more dynamically? As a developer and maintainer of an integration module, I would roughly expect that introducing such automatisms has the following consequences:
- About twenty in a thousand users will not run into problems like yours.
- About fifty a thousand users (including the above) miss an opportunity to learn rudimentary knowledge about how integrators work and reading documentations.
- About one in thousand users will run into a horrible problem with the automatisms that is much more difficult to solve than the above.
- I need to introduce new parameters governing the automatisms that are even harder to grasp for the average user.
- I spend a lot of time in devising and implementing the automatisms.
QUESTION
I often have the problem that R converts my one column data frames into character vectors, which I solve by using the drop=FALSE option.
However, there are some instances where I do not know how to put a solution to this kind of behavior in R, and this is one of them.
I have a data frame like the following:
...ANSWER
Answered 2022-Mar-17 at 09:53You can solve your problem by using lapply instead of sapply, and then combine the result using do.call as follows
QUESTION
I am trying to write some code, that displays data from a database in Laravel. But I have two table values linked to eachother with a foreign key, and when I try to show that on my page, it just shows the id and not the actual name. I saw in another stackoverflow question that you should define the table data values in ur Model, but that doesn't work or I did it wrong. Can someone be so kind to help me fix this please? :)
Model Planet.php:
...ANSWER
Answered 2022-Jan-26 at 12:43replace this line
QUESTION
ANSWER
Answered 2022-Jan-25 at 14:49ANSWER: Underlying problem determined to exist in IDE's compilation/build/execution routine.
Reinstall and update IDE, adoption of non-EOL JDK.
Also, I did not import existing IDE settings.
QUESTION
I made a bubble sort implementation in C, and was testing its performance when I noticed that the -O3 flag made it run even slower than no flags at all! Meanwhile -O2 was making it run a lot faster as expected.
Without optimisations:
...ANSWER
Answered 2021-Oct-27 at 19:53It looks like GCC's naïveté about store-forwarding stalls is hurting its auto-vectorization strategy here. See also Store forwarding by example for some practical benchmarks on Intel with hardware performance counters, and What are the costs of failed store-to-load forwarding on x86? Also Agner Fog's x86 optimization guides.
(gcc -O3 enables -ftree-vectorize and a few other options not included by -O2, e.g. if-conversion to branchless cmov, which is another way -O3 can hurt with data patterns GCC didn't expect. By comparison, Clang enables auto-vectorization even at -O2, although some of its optimizations are still only on at -O3.)
It's doing 64-bit loads (and branching to store or not) on pairs of ints. This means, if we swapped the last iteration, this load comes half from that store, half from fresh memory, so we get a store-forwarding stall after every swap. But bubble sort often has long chains of swapping every iteration as an element bubbles far, so this is really bad.
(Bubble sort is bad in general, especially if implemented naively without keeping the previous iteration's second element around in a register. It can be interesting to analyze the asm details of exactly why it sucks, so it is fair enough for wanting to try.)
Anyway, this is pretty clearly an anti-optimization you should report on GCC Bugzilla with the "missed-optimization" keyword. Scalar loads are cheap, and store-forwarding stalls are costly. (Can modern x86 implementations store-forward from more than one prior store? no, nor can microarchitectures other than in-order Atom efficiently load when it partially overlaps with one previous store, and partially from data that has to come from the L1d cache.)
Even better would be to keep buf[x+1] in a register and use it as buf[x] in the next iteration, avoiding a store and load. (Like good hand-written asm bubble sort examples, a few of which exist on Stack Overflow.)
If it wasn't for the store-forwarding stalls (which AFAIK GCC doesn't know about in its cost model), this strategy might be about break-even. SSE 4.1 for a branchless pmind / pmaxd comparator might be interesting, but that would mean always storing and the C source doesn't do that.
If this strategy of double-width load had any merit, it would be better implemented with pure integer on a 64-bit machine like x86-64, where you can operate on just the low 32 bits with garbage (or valuable data) in the upper half. E.g.,
QUESTION
Scenario
For a map tiling project (think google earth) I have a .mbtile file that I know nothing about other than it has a lot of data about cities on the planet. I've been picking at it for a couple days and have found out the following:
- the file is a sqlite database
- the database has a table
tileswhich is full of blobs - the blobs are binary with gzip signatures
- after unzipping, the result is a protocol buffer
I haven't worked with protobuf much so I'm getting a crash course. I took the unzipped binary and with protoc --decode_raw received the following
ANSWER
Answered 2022-Jan-18 at 16:12working c# protobuf contracts thx to @MarcGravell
QUESTION
I am seeking to find optimal control (aoa and bank angle) to maximize cross range for a shuttle type reentry vehicle using Gekko. Below is my code currently and I am getting a "Solution not found" with "EXIT: Maximum Number of Iterations Exceeded". The simulation assumes a point mass with a non-rotating earth frame. The EOMS are 6 coupled, non-linear ODEs. I have tried using different solvers, implementing/removing state and control constraints, increasing maximum number of iterations, etc. I am not confident with my setup and implementation of the problem in Gekko and am hoping for some feedback on what I can try next. I have tried to follow the setup and layouts in APMonitor's Example 11. Optimal Control with Integral Objective, Inverted Pendulum Optimal Control, and Example 13. Optimal Control: Minimize Final Time. Solutions I'm seeking are below.
Any help is very much appreciated!
...ANSWER
Answered 2022-Jan-14 at 04:17I got a successful solution by decreasing the final time (max=0.04 for successful solution) and rearranging the equations to avoid a possible divide-by-zero:
QUESTION
[Editing this question completely] Thank you , for those who helped in building the Periodic Table successfully . As I completed it , I tried to link it with another of my project E-Search , which acts like Google and fetches answers , except that it will fetch me the data of the Periodic Table .
But , I got a problem - not with the searching but with the layout . I'm trying to layout the x-scrollbar in my canvas which will display results regarding the search . However , it is not properly done . Can anyone please help ?
Below here is my code :
...ANSWER
Answered 2021-Dec-29 at 20:33I rewrote your code with some better ways to create table. My idea was to pick out the buttons that fell onto a range of type and then loop through those buttons and change its color to those type.
QUESTION
Scenario
I'm using unity c# to re-invent a google-earth like experience as a project. New tiles are asynchronously loaded in from the web while a user pans the camera around the globe. So far I'm able to load in all the TMS tiles based on their x & y coordinates and zoom level. Currently I'm using tile x,y to try and figure out where the tile should appear on my earth "sphere" and it's becoming quite tedious, I assume because of the differences between Euler angles and quaternions.
- I'm using the angle of
Camera.mainto figure out which tiles should be viewed at any moment (seems to be working fine) - I have to load / unload tiles for memory management as level 10 can receive over 1 million 512x512 tiles
- I'm trying to turn a downloaded tile's x,y coordinates (2d) into a 3d position & rotation
Question
Using just the TMS coordinates of my tile (0,0 - 63,63) how can I calculate the tile's xyz "earth" position as well as its xyz rotation?
Extra
- in the attached screenshot I'm at zoom level 4 (64 tiles)
- y axis 0 is the bottom of the globe while y axis 15 is the top
- I'm mostly using
Mathf.SinandMathf.Costo figure out position & rotation so far
I've figured out how to get the tile position correct. Now I'm stuck on the correct rotation of the tiles.
The code that helped me the most was found with a question about generating a sphere in python.
I modified to the code to look like so:
...ANSWER
Answered 2021-Dec-07 at 21:20For the positioning and rotation of the planes, you can do that in c#:
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Install earth
You can use earth like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the earth component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .
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