Google Earth (not engine) satellite view has varying spatial resolutions (i.e., pixel size) depending on various factors.
Let's say I'm interested in the below image, I can see it was taken on February 27, 2016, where do I find which satellite took this image and what is the spatial resolution of that image?
I read some answers such as here, but they are not up to date or just don't work.
As you can see by the copyright string on the screen there, the image is likely provided by Maxar (which purchased Digital Globe a few years ago). If you go to their online catalog (https://discover.digitalglobe.com/) and search for your location, plus filter the dates to 2016, you'll find that the archive contains just one image for that location and date, and that it looks very similar to the image in your screenshot. Note that the catalog will only show you a low-res preview of the image, for full resolution you have to purchase it like Google does.
Looks like the image you're seeing there was taken by the GeoEye-1 satellite (abbreviated as GE01), which has approximately 50cm (0.5m) resolution. Technically, the resolution of the multi-spectral (color, etc.) sensor is approx 1.8m, and that data is "pan-sharpened" using the panchromatic (black & white) sensor, which has a resolution of just over 0.4m.
The additional metadata provided for the image in the catalog is this:
Image ID: 1050010003311100
Image Clouds: 0.0%
Image Off Nadir: 29.8°
Bands: 4-BANDS
Max GSD: 0.54m
Sun Elevation: 46.4°
Max Target Azimuth: 116.8°
Browse: view (low-res preview of the entire scene)
Related
I have a few cases of clients that verified their property somewhere in the past year.
To summarize the issue: Google Data Studio has a huge gap in data from say 2 months before the verification, but in GSC itself I can see full 16 months of data. I don't know how to solve this.
You can see the gap in data very clearly on the time series chart (see screenshot). You can also see that Google Search Console itself has the data.
Does anyone else have this issue as well? Did you find a solution or an explanation why this happens?
PS: this is a domain property.
Also: The Data Studio report looks like GSC, because I copied the styling.
data studio gsc data (problem) vs GSC data (full data)
I think there's nothing wrong with your data source, but something is clearly wrong with your chart.
Apparently, there is no missing data, but a misaligned data in your X-axis (in the first chart, notice that your data jump from February to July).
This usually happens when you choose Line chart over Timeseries chart. In Line Chart, missing data points aren't plotted (because they don't exist :), but in timeseries chart, missing data points are plotted as zeros.
I have a Postgis table of about 200 entries for which I have to enter lat/lon coordinates. I use QGIS to process and display them. Is there a way of clicking at the QGIS map and thereby entering the coordinates into the Postgis table?
I can find the coordinates on the map, copy the coordinates and enter them in the table. But that is a lot of work and it is error prone. I browsed thru all plugins, found the digitizing tools promising but this does not do what I want. I googled this specific question but didn't find a clue.
Is what I want possible at all?
I am rather a noob at gis and qgis so it took me some time before I had the right keywords to search with. And the right keyword for what I want to do apparently is "digitize". What I want is partially possible. Links that helped me are:
https://www.igismap.com/digitization-in-qgis-exploring-tools-for-digitizing/
https://www.qgistutorials.com/en/docs/digitizing_basics.html
https://gis.stackexchange.com/questions/41799/adding-shapefiles-to-postgis-database
The gist of it is:
enable the advance digitizing toolbar: view > toolbars > advanced digitizing toolbar
create a new shapefile layer: layer > create new shapefile layer. Don't forget the correct fields, in my case the name of the location. Also try to remember where you store the file (it will be a shapefile), you later need that to import the shapefile into postgis
enable the edit state of the current layer, enable the type of shape you want to import. In my case they were points
click on each location, a dialog pops up with the attributes you should add
later on you should import the shapefile, you need the third link for that together with your memory of where you stored that #$#%$& file
I want to set up data driven subscriptions to mass output png files. The problem is that adding a new Extension for png in rsreportserver.config under Configurations/Extensions/Render only gives one fixed size of png file.
Report A really ought to output a 6in x 3in png file and report B ought to output a 6in x 4in png file.
Yes, I could create multiple entries in rsreportserver.config but this is confusing for end users as they show up on all users' export dropdowns needlessly.
I proposed doing the mass image generation with an external program that generates a custom url for each png (DeviceInfo settings can be part of the url) and uses WebClient.DownloadFile() in a loop, but my supervisor is currently really locked into the idea of data driven subscriptions for whatever reason.
Per #iamdave's suggestion, just setting the overarching page dimensions in report designer does give a suitably sized png file via data driven subscription without having to hardcode png dimensions in rsreportserver.config.
The reason I didn't initially notice this was the reports in question were graphs that were only ever used as subreports on an encompassing megareport and had never really been run as individual standalone reports. When used as a subreport, page dimensions never came into play, so they were left at the default 8.5x11.
Is it possible to highlight a list of countries with a different colors?
I need to display some countries' statistics on the world map.
Now I use an image and fill a region with color (calculated for each country) by country's coordinates. It's a simple solution and it works well. But now I need to specify the countries' name too (and I think it's not the last customization).
There is a polygon solution, but it uses an array of coordinates. I don't think it's a suitable solution to highlight countries's territory.
I haven't found a solution yet. Any suggestions?
Thanks in advance.
Highlighting countries or regions to support statistics is known as Choropleth Mapping
, but unfortunately there usually isn't direct library support for Choropleth maps bundled into an online map API. This means you'll have to create your own framework, but fortunately it is possible to create one - I wrote an example using jQuery + HERE Maps to
answer the question here
Updated WKT solution now available
Access to KML shapes is no longer required, since the Geocoder API now offers an IncludeShapes attribute which returns the shape of a country in WKT format. A WKT parser can be found here.
A simple WKT choropleth example can be found here.
KML Base solution
For any framework you will need to have a file holding the boundaries of the countries or regions you need. The example uses a KML file, but you could also start with polygons if you had them. Country borders are a political minefield, which is the reason I guess most online mapping APIs steer clear of them. As a hint: try starting with something like http://geocommons.com/overlays/119819 and simplify it as much as possible to speed up the rendering- many small wiggles in the coast lines and small outlying islands are unnecessary.
Of course you could also try searching for "create choropleth map" from a search engine of your choice and use an tool to create a static image for your data (potentially at several zoom levels) and then use this as the basis of an map tile overlay. This requires a lot more work up front, but would push all the calculations server side and hence be faster to display.
Working example can be found on GitHub here
You could put the country's name into the image. It's not that difficult to place text into an image. The only tricky bit is if you are using tiles, you need to deal with names that cross tile boundaries by drawing the name once for each tile.
My game is designed with cocos2d-x, the picture resource size is 320x480, which is adapted to iphone4, now I want my game adapt to iphone5, what should I do?, thanks!
It actually depends on your current cocos2d-x version and the resolutions you're planning to support. But basically if you're running the latest stable release (2.0.4) and you only want to support iPhone4 and iphone5 resolutions then you have to:
create the art for both resolutions (this is not mandatory but the graphics might be scaled too much and lose quality).
define at runtime the DesignResolutionSize and ContentScaleFactor based on the actual device's resolution
select the correct resource path
Here a simple example on how it can be implemented:
// Get the real screen size
CCDirector* pDirector = CCDirector::sharedDirector();
CCEGLView* pEGLView = CCEGLView::sharedOpenGLView();
pDirector->setOpenGLView(pEGLView);
// Set the design resolution. Please see the doc for the different modes
pEGLView->setDesignResolutionSize(480, 320, kResolutionNoBorder);
// Here you have to chose between width or height depending your game's design
if (frameSize.width > 480) {
// iphone5
pDirector->setContentScaleFactor(1136/480);
CCFileUtils::sharedFileUtils()->setResourceDirectory("hd");
} else {
// iphone4
pDirector->setContentScaleFactor(1);
CCFileUtils::sharedFileUtils()->setResourceDirectory("sd");
}
/// Now load the sprites....
If you're want to support more iOS/android resolutions please refer to the following links for fullscreen multi-resolution solutions offered by cocos2d-x:
http://www.cocos2d-x.org/projects/cocos2d-x/wiki/Multi_resolution_support
http://www.cocos2d-x.org/projects/cocos2d-x/wiki/Mechanism_of_loading_resources
Hope it helped.
Cocos2D-x 2.0.4+ have very easy solution for multi-resolution problem. ( either iDevices or Android devices.)
In fact you just need to set your DesignResolution and then just imagine your target device will has this resolution.
If target device really has this resolution ( or some other but with same ratio) cocos2d will handle to fix screen and your game looks same in all devices.
And when ratio of target device is different, you have many option ( as cocos2d language, policy) to manage that.
For example if you use Exact fit policy, cocos2d will force your game ( and design) to fit target device screen (without that black boarder).
Exact fit
The entire application is visible in the specified area without trying
to preserve the original aspect ratio. Distortion can occur, and the
application may appear stretched or compressed.
For more detail just take a look at this link : http://www.cocos2d-x.org/projects/cocos2d-x/wiki/Multi_resolution_support