ArcGIS REST API Connector QGIS Plugin - Versionsgeschichte

Stefan: /* Query Syntax of ArcGIS REST API */

2016-02-27T16:20:17Z

Query Syntax of ArcGIS REST API

← Nächstältere Version		Version vom 27. Februar 2016, 16:20 Uhr
Zeile 24:		Zeile 24:
	* http://services.arcgisonline.com/arcgis/rest/services		* http://services.arcgisonline.com/arcgis/rest/services

	== Query ~~Syntax~~ of ~~ArcGIS REST API~~ ==		== Query syntax and other details of the specification ==

	From the [http://resources.arcgis.com/en/help/arcgis-rest-api/index.html#//02r3000000w5000000 "ArcGIS REST API" documentation]:		From the [http://resources.arcgis.com/en/help/arcgis-rest-api/index.html#//02r3000000w5000000 "ArcGIS REST API" documentation]:
Zeile 30:		Zeile 30:
	The Query operation is performed on a feature service resource. The result is a feature sets for each layer in the query. Other result types (such as count of features and array of feature IDs for each layer in the query) are not supported.		The Query operation is performed on a feature service resource. The result is a feature sets for each layer in the query. Other result types (such as count of features and array of feature IDs for each layer in the query) are not supported.

	There is a limit to the number of features included in the response (see the maxRecordCount property of the feature service).		There is a limit to the number of features included in the response (see the maxRecordCount property of the feature service).

			"Feature Service" have functions similar to similar to [[WFS]] but it's a proprietary API. In ArcGIS one can
			* connect/new/edit/delete connection
			* load/save connections
			* filter layer list
			* select layer (then download)

			Other implementation details of "Feature Service":
			* maxRecordCount - currently maxRecordCount is ignored.
			* Query - currently there's no query functionality.
			* outSR - currently geometry is returned as default well-known ID "GCS_WGS_1984".

	== Support ==		== Support ==

Stefan: /* About */

2016-02-27T16:19:16Z

About

@@ Zeile 11: / Zeile 11: @@
 QGIS-Plugin '''ArcGIS REST API Connector''' which reads from ArcGIS Online and ArcGIS Server and the "Esri Open Data Initiative Portal Software".
-Currently reading "Feature Services" (similar to [[WFS]] but proprietary) are supported. "Map Services" (kind of [[WMTS]]) are NOT supported (see e.g. [http://plugins.qgis.org/plugins/quick_map_services/ QuickMapServices Plugin] for a solution).
+This plugin focusses on '''reading''' so-called '''"Maps"''' accessible over the Internet by interpreting JSON (JavaScript Object Notation) similar to [[WFS]].
-This plugin focusses on '''reading''' so-called '''"Maps"''' accessible without restrictions over the Internet by interpreting JSON (JavaScript Object Notation) and image output formats.
+Note that "Map Services" are not supported. Map Services are comparable with [[WMS]] and WMTS. They expose a set of tiled images, read-only, working with the default data frame of the published map document on the server.
 == Available ArcGIS Services ==

Stefan: /* About */

2016-02-27T16:14:03Z

About

← Nächstältere Version		Version vom 27. Februar 2016, 16:14 Uhr
Zeile 21:		Zeile 21:
	* select layer (then download)		* select layer (then download)

	Implementation details of Feature Service:		Supports HTTP "Basic Authentication" and "NTLM authentication".

			Implementation details of "Feature Service":
	* maxRecordCount - currently maxRecordCount is ignored.		* maxRecordCount - currently maxRecordCount is ignored.
	* Query - currently there's no query functionality.		* Query - currently there's no query functionality.
	* outSR - currently geometry is returned as default well-known ID "GCS_WGS_1984".		* outSR - currently geometry is returned as default well-known ID "GCS_WGS_1984".

	Map ~~services~~ expose a set of tiled images, read-only, working with the default data frame of the published map document on the server.		Note that "Map Services" are not supported. They expose a set of tiled images, read-only, working with the default data frame of the published map document on the server.

	== Available ArcGIS Services ==		== Available ArcGIS Services ==

Stefan am 4. Dezember 2015 um 19:41 Uhr

2015-12-04T19:41:10Z

← Nächstältere Version		Version vom 4. Dezember 2015, 19:41 Uhr
Zeile 54:		Zeile 54:
	General improvements may include		General improvements may include
	* Authentification (with OAuth 2.0)		* Authentification (with OAuth 2.0)
	* Image Service.
	* HttpProxy ([https://github.com/geometalab/ArcGISConnector-QGIS-Plugin/issues/3 issue #3])		* HttpProxy ([https://github.com/geometalab/ArcGISConnector-QGIS-Plugin/issues/3 issue #3])

Stefan: /* Installation and Source Code */

2015-11-01T23:49:10Z

Installation and Source Code

← Nächstältere Version		Version vom 1. November 2015, 23:49 Uhr
Zeile 73:		Zeile 73:
	== Installation and Source Code ==		== Installation and Source Code ==

	Install from inside [[QGIS]] as Python plugin.		Install from inside [[QGIS]] as Python plugin (Note: For versions below 1 (0.1 - 0.9) you have to enable "experimental plugins").
	* Published in QGIS plugin directory: http://plugins.qgis.org/plugins/connector/		* Published in QGIS plugin directory: http://plugins.qgis.org/plugins/connector/
	* Source Code on [https://github.com/geometalab/ArcGISConnector-QGIS-Plugin github]		* Source Code on [https://github.com/geometalab/ArcGISConnector-QGIS-Plugin github]

	~~Version History:~~
	* 0.1.0 - First experimental version for broader testing purposes released 11.4.2014 based on QGIS Version 2.4.
	* 0.1.1 - Current experimental version on plugins.qgis.org tested on QGIS Version 2.6.

	[[Kategorie:QGIS-Plugin]] [[Kategorie:QGIS]] [[Kategorie:Python]] [[Kategorie:Software]] [[Kategorie:ArcGIS]]		[[Kategorie:QGIS-Plugin]] [[Kategorie:QGIS]] [[Kategorie:Python]] [[Kategorie:Software]] [[Kategorie:ArcGIS]]

Stefan: /* About */

2015-09-29T18:21:59Z

About

← Nächstältere Version		Version vom 29. September 2015, 18:21 Uhr
Zeile 11:		Zeile 11:
	QGIS-Plugin '''ArcGIS REST API Connector''' which reads from ArcGIS Online and ArcGIS Server and the "Esri Open Data Initiative Portal Software".		QGIS-Plugin '''ArcGIS REST API Connector''' which reads from ArcGIS Online and ArcGIS Server and the "Esri Open Data Initiative Portal Software".

	Currently reading "Feature Services" (similar to [[WFS]] but proprietary) ~~and~~ "Map Services" (kind of [[WMTS]]) are supported.		Currently reading "Feature Services" (similar to [[WFS]] but proprietary) are supported. "Map Services" (kind of [[WMTS]]) are NOT supported (see e.g. [http://plugins.qgis.org/plugins/quick_map_services/ QuickMapServices Plugin] for a solution).

	This plugin focusses on '''reading''' so-called '''"Maps"''' accessible without restrictions over the Internet by interpreting JSON (JavaScript Object Notation) and image output formats.		This plugin focusses on '''reading''' so-called '''"Maps"''' accessible without restrictions over the Internet by interpreting JSON (JavaScript Object Notation) and image output formats.

Stefan am 26. September 2015 um 18:10 Uhr

2015-09-26T18:10:37Z

← Nächstältere Version		Version vom 26. September 2015, 18:10 Uhr
Zeile 34:		Zeile 34:
	* http://services.arcgisonline.com/arcgis/rest/services		* http://services.arcgisonline.com/arcgis/rest/services

	== ~~Installation and Source Code~~ ==		== Query Syntax of ArcGIS REST API ==

			From the [http://resources.arcgis.com/en/help/arcgis-rest-api/index.html#//02r3000000w5000000 "ArcGIS REST API" documentation]:

			The Query operation is performed on a feature service resource. The result is a feature sets for each layer in the query. Other result types (such as count of features and array of feature IDs for each layer in the query) are not supported.

	~~Install from inside [[QGIS]] as Python plugin.~~		There is a limit to the number of features included in the response (see the maxRecordCount property of the feature service).
	* Published in ~~QGIS plugin directory: http://plugins.qgis.org/plugins/connector/~~
	* Source Code on [https://github.com/geometalab/ArcGISConnector-QGIS-Plugin github]

	~~Version History:~~
	* 0.1.0 - First experimental version for broader testing purposes released 11.4.2014 based on QGIS Version 2.4.
	* 0.1.1 - Current experimental version on plugins.qgis.org tested on QGIS Version 2.6.

	== Support ==		== Support ==
Zeile 73:		Zeile 71:
	* WMTS		* WMTS

	== ~~Feasibility analysis~~ and ~~solution approach Carmelo Schumacher~~ ==		== Installation and Source Code ==
	~~Because of the limited functionality python plugins have, only a very basic set of features can be implemented.~~
	~~The best solution is to write an own data provider - but this would require the plugin to be written in C++.~~

	~~FeatureServer->FeatureLayer~~:		Install from inside [[QGIS]] as Python plugin.
	(http://~~resources~~.~~arcgis~~.~~com/en/help/arcgis-rest-api/#~~/~~Query_Feature_Service~~/~~02r3000000w5000000~~/)		* Published in QGIS plugin directory: http://plugins.qgis.org/plugins/connector/
	~~Use OGR as the dataprovider for a QgsVectorLayer with datasource URL to FeatureServer with query:~~		* Source Code on [https://github.com/geometalab/ArcGISConnector-QGIS-Plugin github]
	~~/query?where=objectid+%3D+objectid&outfields=~~*~~&f=json~~
			Version History:
	~~MapServer->FeatureLayer:~~		* 0.1.0 - First experimental version for broader testing purposes released 11.4.2014 based on QGIS Version 2.4.
	~~(http~~://~~resources.arcgis~~.com/en/~~help/arcgis~~-~~rest~~-~~api/#/Query_Map_Service_Dynamic_Layer/02r3000000z6000000/)~~		* 0.1.1 - Current experimental version on plugins.qgis.org tested on QGIS Version 2.6.
	Because MapServer-Queries are restricted by a limit on the number of features included in the feature set response (max 1000), /query?where=objectid+%3D+objectid&outfields=*&f=json will return only 1000 features max. To overcome this restriction, multiple service calls are needed to populate the whole feature-list.

	~~Possible Solution~~:
	* 1 ~~Check if layer has more than 1000 features (using query parameter returnCountOnly=true)~~.
	* 2a If not, same procedure as featureServer-~~>FeatureLayer -> stop~~
	* 2b If yes use OGR Virtual Format (http://www.~~gdal~~.~~org/drv_vrt~~.~~html) to join all the service calls needed, to retreive all features (use union layer)~~. Populate the xml first and add to OGR provider. The different queries can be generated by getting all the id's of all the features first (returnIdsOnly=true) and include the id's in the query (max 1000 / query).

	~~MapServer->RasterLayer:~~
	* ~~OGR can handle raster queries (http://www.gdal.org/frmt_wms.html search for ArcGIS REST API (GDAL 2.~~0 ~~and later)):~~

	~~$ gdallocationinfo -wgs84 "<GDAL_WMS><Service name=\"AGS\"><ServerUrl>http://sampleserver1~~.~~arcgisonline~~.~~com/ArcGIS/rest/services/Specialty/ESRI_StateCityHighway_USA/MapServer</ServerUrl><BBoxOrder>xyXY</BBoxOrder><SRS>3857</SRS></Service><DataWindow><UpperLeftX>~~-~~20037508~~.~~34</UpperLeftX><UpperLeftY>20037508~~.~~34</UpperLeftY><LowerRightX>20037508.34</LowerRightX><LowerRightY>-20037508~~.~~34</LowerRightY><SizeX>512</SizeX><SizeY>512</SizeY></DataWindow></GDAL_WMS>" -75.704 39.75~~

	~~Only bounding box need to be updated on every pan (and zoom?)~~.

	[[Kategorie:QGIS-Plugin]] [[Kategorie:QGIS]] [[Kategorie:Python]] [[Kategorie:Software]] [[Kategorie:ArcGIS]]		[[Kategorie:QGIS-Plugin]] [[Kategorie:QGIS]] [[Kategorie:Python]] [[Kategorie:Software]] [[Kategorie:ArcGIS]]

CSchumac am 25. September 2015 um 07:12 Uhr

2015-09-25T07:12:51Z

← Nächstältere Version		Version vom 25. September 2015, 07:12 Uhr
Zeile 4:		Zeile 4:
	* A project by [[Geometa Lab]] HSR		* A project by [[Geometa Lab]] HSR
	* Project Lead: Stefan Keller		* Project Lead: Stefan Keller
	* Authors/Developers: Tobias Schmitz, Rafael Krucker and Dennis Ligtenberg		* Authors/Developers: Carmelo Schumacher, Tobias Schmitz, Rafael Krucker and Dennis Ligtenberg

Stefan: Die Seite wurde neu angelegt: „| QGIS-Plugin '''ArcGIS REST API Connector''' (beta) which reads from ArcGIS Online and ArcGIS Server and the "…“

2015-05-30T23:11:39Z

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[[Datei:Quiz_QGIS_Plugin_Icon.png|right|||]]
[[QGIS]]-Plugin '''ArcGIS REST API Connector''' (beta) which reads from [[ArcGIS]] Online and ArcGIS Server and the "Esri Open Data Initiative Portal Software".

* A project by [[Geometa Lab]] HSR
* Project Lead: Stefan Keller
* Authors/Developers: Tobias Schmitz, Rafael Krucker and Dennis Ligtenberg

== About ==

QGIS-Plugin '''ArcGIS REST API Connector''' which reads from ArcGIS Online and ArcGIS Server and the "Esri Open Data Initiative Portal Software".

Currently reading "Feature Services" (similar to [[WFS]] but proprietary) and "Map Services" (kind of [[WMTS]]) are supported.

This plugin focusses on '''reading''' so-called '''"Maps"''' accessible without restrictions over the Internet by interpreting JSON (JavaScript Object Notation) and image output formats.

Functions (similar to WFS) "Add ArcGIS REST Layer...":
* connect/new/edit/delete connection
* load/save connections
* filter layer list
* select layer (then download)

Implementation details of Feature Service:
* maxRecordCount - currently maxRecordCount is ignored.
* Query - currently there's no query functionality.
* outSR - currently geometry is returned as default well-known ID "GCS_WGS_1984".

Map services expose a set of tiled images, read-only, working with the default data frame of the published map document on the server.

== Available ArcGIS Services ==

* http://sampleserver1.arcgisonline.com/arcgis/rest/services
* http://sampleserver6.arcgisonline.com/arcgis/rest/services
* http://services.arcgisonline.com/arcgis/rest/services

== Installation and Source Code ==

Install from inside [[QGIS]] as Python plugin.
* Published in QGIS plugin directory: http://plugins.qgis.org/plugins/connector/
* Source Code on [https://github.com/geometalab/ArcGISConnector-QGIS-Plugin github]

Version History:
* 0.1.0 - First experimental version for broader testing purposes released 11.4.2014 based on QGIS Version 2.4.
* 0.1.1 - Current experimental version on plugins.qgis.org tested on QGIS Version 2.6.

== Support ==

Project notes, issues, bugs and feature requests: See [https://github.com/geometalab/ArcGISConnector-QGIS-Plugin github] (for older notes see tab "Diskussion").

== Possible Enhancements ==

According to Esri's specification of [http://resources.arcgis.com/en/help/arcgis-rest-api/index.html#/The_ArcGIS_REST_API/02r300000054000000/ "ArcGIS REST API"]], there are many services: ''... With ready-to-use basemaps, reference layers, and so on, you can quickly add context or a backdrop to your local or worldwide data. Some ArcGIS Online maps are thematic, which may provide all the information you need to present in your application''.

Future improvements may be made to Feature Service, Map Service and additionally to a new Image Service, which provides access to raster data similar to Map Services. Both Map and Image services return raster images mosaicked on the fly or WMTS whereas the main difference is that Map Services are read-only while Image Service include an API for editing and uploading (which is out-of-scope of this plugin).

General improvements may include
* Authentification (with OAuth 2.0)
* Image Service.
* HttpProxy ([https://github.com/geometalab/ArcGISConnector-QGIS-Plugin/issues/3 issue #3])

Future improvements of Feature Service may include:
* Paging (maxRecordCount) See [https://github.com/geometalab/ArcGISConnector-QGIS-Plugin/issues/6 issue #6]
* Local Feature Cache (see [http://resources.arcgis.com/en/help/main/10.2/index.html#/Managing_your_local_display_cache/006600000180000000/])
* Query and Query Related Records
* Dealing with compressed http content?
* Reading/showing "Services Directory"

Future improvements of Map Service may include:
* Feature (aka OGC WMS GetFeatureInfo?)
* Image (Marker)?
* Legend (aka WMS GetLegend)
* Map Tile
* WMTS

== Feasibility analysis and solution approach Carmelo Schumacher ==
Because of the limited functionality python plugins have, only a very basic set of features can be implemented.
The best solution is to write an own data provider - but this would require the plugin to be written in C++.

FeatureServer->FeatureLayer:
(http://resources.arcgis.com/en/help/arcgis-rest-api/#/Query_Feature_Service/02r3000000w5000000/)
Use OGR as the dataprovider for a QgsVectorLayer with datasource URL to FeatureServer with query:
/query?where=objectid+%3D+objectid&outfields=*&f=json

MapServer->FeatureLayer:
(http://resources.arcgis.com/en/help/arcgis-rest-api/#/Query_Map_Service_Dynamic_Layer/02r3000000z6000000/)
Because MapServer-Queries are restricted by a limit on the number of features included in the feature set response (max 1000), /query?where=objectid+%3D+objectid&outfields=*&f=json will return only 1000 features max. To overcome this restriction, multiple service calls are needed to populate the whole feature-list.

Possible Solution:
* 1 Check if layer has more than 1000 features (using query parameter returnCountOnly=true).
* 2a If not, same procedure as featureServer->FeatureLayer -> stop
* 2b If yes use OGR Virtual Format (http://www.gdal.org/drv_vrt.html) to join all the service calls needed, to retreive all features (use union layer). Populate the xml first and add to OGR provider. The different queries can be generated by getting all the id's of all the features first (returnIdsOnly=true) and include the id's in the query (max 1000 / query).

MapServer->RasterLayer:
* OGR can handle raster queries (http://www.gdal.org/frmt_wms.html search for ArcGIS REST API (GDAL 2.0 and later)):

$ gdallocationinfo -wgs84 "<GDAL_WMS><Service name=\"AGS\"><ServerUrl>http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Specialty/ESRI_StateCityHighway_USA/MapServer</ServerUrl><BBoxOrder>xyXY</BBoxOrder><SRS>3857</SRS></Service><DataWindow><UpperLeftX>-20037508.34</UpperLeftX><UpperLeftY>20037508.34</UpperLeftY><LowerRightX>20037508.34</LowerRightX><LowerRightY>-20037508.34</LowerRightY><SizeX>512</SizeX><SizeY>512</SizeY></DataWindow></GDAL_WMS>" -75.704 39.75

Only bounding box need to be updated on every pan (and zoom?).

[[Kategorie:QGIS-Plugin]] [[Kategorie:QGIS]] [[Kategorie:Python]] [[Kategorie:Software]] [[Kategorie:ArcGIS]]