If the result of the sql query entered returns a spatial column, the output will be a feature layer. Aug 14, 2017 downloading feature layer attachments via the arcgis api for python. Query layers will only work with enterprise databases. Mapimagelayer dynamic data layer with query table arcgis. Python api designed to work externally with arcgis rest services to query and extract data, and view service properties. Extract a map service layer to shapefile using python spatial times. The feature class can then be shared easily between geodatabases via copypaste. The createquery method is available as a convenience to the user. When bringing over the rest service to copy into the python script itd have everything you need up to featureserver but then you have to append in the createreplica at the end of the statement or only copy and replace your service name into the script to replace. Before you can create a query layer, you must first make a connection to the database project. Feb 15, 2011 the new add query layer function in arcgis 10 is just what ive been looking for.
The queryfeatures method allows the user to query the features in a featurelayer based on an input query object. The following are code examples for showing how to use arcpy. Specific feature class published with a layer definition query as a. Append values from the source csv to the target feature layer. Oct 07, 2011 i see the make query layer in the data managementlayers and table views toolbox which is great. It can add a layer with autoarrange logic that places the new layer in a data frame similarly to how the add data button works in arcmap. Download dataset from arcgis rest service geographic. Make feature layerdata management toolbox documentation. Feature layers can be added to and visualized using maps. Feb 11, 2016 a tool to download a layer from an arcgis web service as geojson. Tool now supports using a where clause to query the service.
The script will run on a the specified public feature layer and download the attachments to. Arcgis geoprocessing tool that creates a query layer from a dbms table based on an input sql select statement. Osmquery is a python toolbox for making it easy easier to get data out of openstreetmap osm and into the esri ecosystem. Convert results to a shapefile or other feature class type 1 query the web service. You can persist a query layer by exporting it to a feature class. You make a database connection and add layers or tables from the database to your map.
Grab updates from an online source and push those changes into an feature service arcpyautomaticupdatesintofeatureservice. President and founder of loki intelligent corporation, a location information firm located in san francisco, california, he is an expert in realtime geographic information systems and analysis automation. Query layers behave like any other feature layer or standalone table, so they can be used to display data, used as input into a geoprocessing tool, or accessed programmatically using developer apis. Add a point scene layer add an integrated mesh layer arcgis map image layer arcgis raster function service arcgis tiled layer arcgis vector tiled layer url blend renderer browse wfs layers change feature layer renderer change sublayer renderer colormap renderer control annotation sublayer visibility create a feature collection layer from a. With osmquery, you can query an area of interest for osm data of specified kind and obtain feature layers of the results, with point, line andor area features depending on what kind of data osm holds for your area. Finally, i would prefer not to download the arcgis online layer, run arcpy scripts on it locally, then republish the layer, since this tends to reset.
In my scenario, i see many query layers created with an oracle 11g client connection. The layer object has a single, generic design to work with all layers. Silas toms is a certified gis professional and the author of the first edition of arcpy and arcgis. Rather than creating individual layer objects for all possible layer types and property combinations, a support method was created to help identify which layer types support which properties.
Help with layer file definition query in arcpy geonet. Connecting to postgis database from arcmap for display and query. A simple library that can download a layer from a map in an arcgis web service and convert it to something useful. Update a hosted feature layer in arcgis online with. Definition queries arcpy and arcgis geospatial analysis. Alright, now that the legal stuff is out of the way lets get down to some coding. After a query layer has been created, it can be saved as a layer file. Mar 28, 2016 map service to shapefile using python. In some cases, such as in a continuous project that requires frequent updates, a hosted feature layer must be constantly updated with data from an external feature class each time there is new data. Specify the index of the layer at the end of your url.
For example, a feature layer supports a definition query, whereas a raster layer does not, but a raster catalog does. Use python to update multiple definition queries summary. The temporary feature layer can be saved as a layer file using the save to layer file tool or can be saved as a new feature class using the copy features tool complex feature classes, such as annotation and dimensions, are not supported by this tool. I would also like to know if there is the ability to edit a query layer, that is already created, through python. A simple util to download a layer from arcgis web servers schwankstapythonarcgisrestquery. File geodatabases are not a valid input workspace for this tool. Definition queries an important property of layer objects is the ability to dynamically set definition queries. There are numerous types of layers and not all of them support the same set of properties. Also includes a subpackage for administering arcgis server sites. The connection dropdown list shows available database connections. Python in arcgis proarcpy get started documentation. Besides, the limitation was built around the idea of a worstcase scenario, i.
A simple util to download a layer from arcgis web servers schwankstapython arcgisrestquery. Unfortunately, there is no way to edit the query table after it was created in arcmap using arcpy. Since its running without error, i suspect this wont help, but you could also try using the add field delimeters method for the field name. Extract a map service layer to shapefile using python. Python script to pull hosted features with attachments into a. Some arcgis server image services allow for data download, but this isnt one of those. You use the new query layer dialog box in arcmap to create query layers. This can be useful for determining if any features matched the desired spatial relationship before proceeding to further analysis as part of an automated workflow that is, script or model. The get count tool can be used to find the number of features selected by the select layer by location tool. You can vote up the examples you like or vote down the ones you dont like.
A query layer in arcgis is a spatial layer or standalone table from a database defined by an sql query. Arcgis server map services are a pretty cool thing. Arcgis geoprocessing tool for creating a query layer from a dbms table based on an input sql select statement. It returns a query object that already respect the layer s definitionexpression if one is present. Insert new features and update upsert attribute values from a file geodatabase download the target feature layer data. Before you can create a query layer, you must first make a connection to a database. Update a hosted feature layer in arcgis online with data from an external feature class summary. To create a query layer on a spatial database, you must complete the following. For this example we will download us states from esris arcgis server sample server. Python is a free, crossplatform, opensource programming language that is both powerful and easy to learn.
Updating multiple definition queries for layers in a map document can be a timeconsuming. Also note that it is a feature layer and we can query it. However, if the layer created by make feature layer in a model is saved as permanent data feature class or shapefile, and that permanent data is returned to the map as an output parameter, the label properties from the layer file are correctly applied. After a connection to the database is established, a list of tables and views found in that database populates the left window of the dialog box. Addlayer is an easy way to add a layer or group layer into a map document. They act as inputs to and outputs from feature analysis tools. Before you can create a query layer, you must first make a connection to the database. Download arcgis online feature service or arcgis server featuremap service. Use a regular feature layer and set its definition query using layer object using arcpy. For example, a feature layer supports a definition query whereas a raster layer does not, but a raster catalog does. If the sql query does not return a spatial column, the output will be a standalone table. Configure database and clients to use query layershelp arcgis. The connection dropdown list shows available database connections after a connection to the database is established, a list of tables and views found in that database populates the left window of the dialog box.
Make query layerdata management toolbox documentation. Using feature layers the feature layer is the primary concept for working with features in a gis. Uses arcpy for some functions if available, otherwise uses open source alternatives to interact with the arcgis rest api. A definition query is a sql statement where clause that limits the data available selection from arcpy and arcgis geospatial analysis with python book. Since then, it has been accepted as the scripting language of choice for geoprocessing users and. Using the arcpy python library with hosted feature service layers. Is it possible to create such a query layer via geoprocessing tools like arcpy or is it limited to the option in the add data menu. Rather than having to work with different, individual layer. In arcmap, rightclick on a query layer in the table of contents.
This sample demonstrates how to add a sublayer with features from a query table data source in a mapimagelayer the querytabledatasource can be used to dynamically render a spatial table that doesnt have an associated geodabase. You can get the information youre looking for through the query operation, but it will take multiple queries as the max record return limit on this service is, and there are over 58000 records in the v14 layer alone. Since query layers use sql to directly query database tables and views, spatial information used by a query layer is not required to be in a geodatabase. Users create, import, export, analyze, edit, and visualize features, i. If you have ever worked with arcgis rest services, either through arcgis online or. You use the add data button on the map tab to create query layers. We are essentially just going to wrap 3 small steps into a python file. Unable to download a pdf from an arcgis enterprise site with the.
1470 1337 1469 564 1485 1119 1212 236 890 788 469 1472 1422 785 1638 1648 994 211 1027 1044 1561 1149 1330 1628 1175 966 910 597 1348 570 1371 20 1487 656 590