According to the standard, there's a type such as "object" shown below. What is this type for and what other types can we use? Can I use like "art?"
{
"title": "Asset Metadata",
"type": "object",
"properties": {
"name": {
"type": "string",
"description": "Identifies the asset to which this NFT represents"
},
"description": {
"type": "string",
"description": "Describes the asset to which this NFT represents"
},
"image": {
"type": "string",
"description": "A URI pointing to a resource with mime type image/* representing the asset to which this NFT represents. Consider making any images at a width between 320 and 1080 pixels and aspect ratio between 1.91:1 and 4:5 inclusive."
}
}
}
It's the datatype of the described item according to the JSON Schema specification. It's a standard used in other development fields as well - not limited just to NFTs or blockchain development.
There is a list of default allowed type values: http://json-schema.org/understanding-json-schema/reference/type.html
It's possible to create a custom type in JSON Schema, but the limited scope of what the "ERC-721 Metadata Document" document allows, doesn't effectively allow for custom types.
TLDR: Cannot use type: "art" in an "ERC-721 Metadata Document". Can use it in a larger scope (e.g. a REST endpoint definition).
I have a geoJSON object like the following (according to: http://geojson.org/):
{
"type": "Feature",
"geometry": {
"type": "Point",
"coordinates": [125.6, 10.1]
},
"properties": {
"name": "Dinagat Islands"
}
}
I have the following UML class and need to represent this location in class diagram:
the BusinessLocation attribute will be of type geoJSON location shown in the first snippet. Do I need to have additional structures in the class diagram that clarifies Location i.e. the Location has a type, a geometry with a type, coordinates...etc? Thanks in advance.
You would need to show the class structure of Location and make an association with Business:
I uses lower case for the owned property businessLocation.
geometry and properties are structured and should be specified as class structures as well (did not do that here).
You might stereotype Location with <<JSON>> or so if you like.
As per the graphhopper 0.9 release, it says
A new graph change API to change road speed and access properties, #845. Can be applied before preprocessing or per-request.
how do i use it, can someone point me to the documentation with example ?
thanks for your support
Indeed there is no good documentation at the moment. Have a look into the tests:
Disable speed mode - set prepare.ch.weightings=no in the config.properties
Create a GeoJSON where e.g. you want to change the access properties to false (blocking):
{
"type": "FeatureCollection",
"features": [{
"type": "Feature",
"geometry": {
"type": "Point",
"coordinates": [1.521692, 42.522969]
},
"properties": {
"vehicles": ["car"],
"access": false
}
}]
}
Then POST this as json to the /change endpoint.
Please note that in 0.9.0
for geometry type only Point, MultiPoint and LineString are supported.
for the properties only access (Boolean) and speed (Double) are supported that can be applied to multiple vehicles (but only in both directions).
You can also use the Java equivalent.
Please see this issue to improve the documentation.
I am new to JSON and I am trying to understand it. So I want to specify a rectangle. Therefor I am using a FeatureCollection in JSON. According to this example I have this:
{ "type": "FeatureCollection",
"features": [
{ "type": "Feature",
"geometry": {
"type": "Polygon",
"coordinates": [
[ [0.0, 0.0], [5.0, 0.0], [5.0, 5.0],
[0.0, 5.0], [0.0, 0.0] ]
]
},
"properties": {
"prop0": "value0",
"prop1": {"this": "that"}
}
}
However, I am not sure what to set as a property?
I am assuming prop0 could be something like a name, but what is prop1? Something like type number or coordinates again?
"properties": {
"name": "null island",
"prop1": {"type": "number"}
}
You seem to be referring to GeoJSON. From the documentation:
"A GeoJSON object with the type "Feature" is a feature object.
A feature object must have a member with the name "geometry". The value of the geometry member is a geometry object as defined above or a JSON null value.
A feature object must have a member with the name "properties". The value of the properties member is an object (any JSON object or a JSON null value).
If a feature has a commonly used identifier, that identifier should be included as a member of the feature object with the name "id". "
In JSON, values are arrays, objects (a collection of key-value pairs, often referred to as dictionaries, maps, hashes, associative arrays), strings, numbers, boolean values, and null values.
The "properties" key can have either "null" as its value, or an object (dictionary). Each value in the dictionary can be anything, including another dictionary.
After seeing a recent video by the Google Devs I decided to do a regional map of the UK. There were a couple of possibilities mentioned on this site that I've since had to dismiss*
So I ended up using this site (example page of data downloads): http://mapit.mysociety.org/area/11804.html
Notice the GeoJSON download as the third link down? Its about a 1Mb file size. When I first tried using it with my map:
function initMap(){
var ukc = new google.maps.LatLng(54.8, -4.6);
var mapOptions = {
zoom: 5,
center: ukc
};
map = new google.maps.Map(document.getElementById('map-canvas'), mapOptions);
map.data.loadGeoJson('http://local.mapsite.com:8080/app/jsondata/eastern.json');
}
$(document).ready(function(){
initMap();
});
I got the above error: Uncaught InvalidValueError: not a Feature or FeatureCollection
Fix Attempt 1 - Google it
Googling the error came back with nothing useful.
Fix Attempt 2 - Shrink it
I thought maybe it was the sheer size of the beast so I shrank it using mapshaper.org to a more manageable 10K. Still no luck!
Fix Attempt 3 - Lint it
Maybe my GeoJSON was badly formatted? But how could it be considering it was right there working on mapit.org but I found this wonderful site for linting GeoJSON data: http://geojsonlint.com/ - The linting worked! Apparently the GeoJSON worked so well that it drew my polygon of East Anglia on the UK in all its glory (note geojsonlint uses OpenStreetMap). But still No Luck
Fix Attempt 4 - TopoJson
Hoping I could combine the regions and compress at the same time I thought desperately that topojson would work. I tried - I still got that same error. Here's a link to my topojson file shared on Google Drive: someregions.json No luck.
Fix Attempt 5 - Add Feature code to start of JSON
The current GeoJSON file starts
{"bbox":[-0.745702,51.448473,1.767999,52.98991],"type":"GeometryCollection","geometries":...
I added:
{"type": "Feature", "bbox":[-0.745702,51.448473,1.767999,52.98991],"type":"GeometryCollection","geometries":
Fix Attempt 6
Retry different regions as they donm't contain the bbox parameter near the start but simply start
{ "type": "Polygon", "coordinates": [ [ [ -3.155785, 53.427385 ], [ -3.151533, 53.427328 ], [...
Still no luck.
In (Failed) Conclusion
Even though I proved my file was small enough, linted and worked elsewhere I still got those infuriating error messages from the console when attempting to put them on my map.
Uncaught InvalidValueError: not a Feature or FeatureCollection
Here is my shrunk GeoJSON file publically shared via GDrive: https://drive.google.com/file/d/0B42Aec8RKcHtNVNZZUxqV0Y5Rkk/edit?usp=sharing
My next attempts will involve topojson to compress all regions into one with internal borders but I wanted to check here first to see if anyone knows what my problem could be? Because that may be another few hours of futile energy wasted.
* Attempting to use Ordanance Survey data failed as they provided SHD data and not SHP as stated in a previous question on the subject. So I couldn't convert it into GeoJSON using ogr2ogr.
The specification for GeoJSON can be found at http://geojson.org/geojson-spec.html
Relevant (though experimental) Google Maps API documentation can be found at https://developers.google.com/maps/documentation/javascript/3.exp/reference#Data
So it looks like for GeoJSON to be acceptable by Google Maps, you need to wrap a Polygon (or similar) returned by MapIt in a Feature or FeatureCollection, here's an example for bermuda-triangle:
{ "type": "FeatureCollection",
"features": [
{ "type": "Feature",
"geometry": {
"type": "Polygon",
"coordinates":
[
[
[-80.190262,25.774252],
[-66.118292,18.466465],
[-64.75737,32.321384],
[-80.190262,25.774252]
]
]
}
}
]
}
for the data provided by http://mapit.mysociety.org/area/11804.html it has to be:
{ "type": "FeatureCollection",
"features": [
{ "type": "Feature",
"geometry": /** paste here the complete output of
http://mapit.mysociety.org/area/11804.geojson **/
}
]
}
I had the same problem (or at least similar) and solved it by introducing one extra step.
Origin of the data:
My semantic Network delivers on a first round request the data about the caves in Southern France in GeoJSON format. This is directly imported via:
map.data.loadGeoJson(theUrl);
As we might want to work independent of the semantic network with these data (the app is a thick client) the caves are locally stored via jStorage.
Iterating of the features of the map and storing these objects directly in jStorage failed because of circular references.
I made a handcrafted routine (not generic enough but suiting the purpose) to transform the map.data.Feature into a javascript object that could be stored.
When getting the data from the store:
var cave = $.jStorage.get(key);
map.data.addGeoJson(cave);
throws the Uncaught InvalidValueError: not a Feature or FeatureCollection error.
But:
var geojson = JSON.parse(cave);
map.data.addGeoJson(geojson);
Works fine.
My interpretation is that the function addGeoJson needs a javascript object and not a string.
Sample geoJson (the orignal "cave") value:
{ "type": "Feature", "geometry": {"type": "Point", "coordinates": [5.368743302306143, 44.0421921072459]},"id": "84.MON.014", "properties": {"nom": "Aven du Grand Guérin", "nid": "7b4703-f387f6f544-0750e59f441be7bb30a7e097c5d725f7", "nature": "Aven", "nodeTime": 1400743203325, "dataId": "5b66137c-1461fdfe5ca-f528764d624db129b32c21fbca0cb8d6", "status": 1}}
If you are looking to load the data to a JavaScript variable then use this
var map = new google.maps.Map(document.getElementById("googleMap"), mapProp);
var data = map.data.loadGeoJson("GeoJSONfilename.geojson");
googleMap is the div id where you want your map to be presented, and GeoJSONfilename.geojson where you saved your GeoJSON data.
I had the same error, but the problem was something very simple. On my GeoJSON, instead of
"type": "Feature"
I had
"type": "feature"
(note the lowercase 'f')
Once I fixed this, the error was gone.
I had the same error message. My .json file missed one line of code on line 2:
"type": "FeatureCollection",
Before I had in my .json-file:
{
"features": [
{
"type": "Feature",
"properties": {
"stroke": "#ECD911",
"stroke-width": 5
},
"geometry": {
"type": "LineString",
"coordinates": [
[13.295141458511353, 52.5069227387063],
[13.295291662216187, 52.50721006978328],
[13.29544186592102, 52.507471278223285]
]
}
}
]
}
It fixed it for me with:
{
"type": "FeatureCollection",
"features": [
{
"type": "Feature",
"properties": {
"stroke": "#ECD911",
"stroke-width": 5
},
"geometry": {
"type": "LineString",
"coordinates": [
[13.295141458511353, 52.5069227387063],
[13.295291662216187, 52.50721006978328],
[13.29544186592102, 52.507471278223285]
]
}
}
]
}