ExtractImages Service - v1.4

Owned by Scott Jonker
Dec 06, 2024
16 min read

 

 

Introduction

The ExtractImages service will take a point or polygon and return one or more discrete RGB images, depending on the parameters of the request. This service retrieves Nadir and Oblique Images from both the Geomni and Vexcel libraries covering both Blue Sky and Gray Sky collections. Due to the broad collection specifications (multi-sensor, multi-library, multi-camera-orientation, etc. ) this is a diverse compilation of data with an enormous list of potential uses, including:

  • Aerial Survey

  • Disaster Assessment

  • Engineering/Construction

  • Navigation/network planning

  • Landscape Change Detection

Use a service such as ImageLayerCoverage Service, FindImagesInPoint Service or FindImagesInPolygon Service to query for image coverage.

 



Technical Details

The ExtractImages service is accessed by specifying a point (latitude and longitude) or polygon (well-known-text). Depending on parameters, this service will return the whole image or a portion of the image. In addition to the standard GET request, this service offers the ability to overlay drawing elements (vector and text data) on imagery using POST calls. While NIR images may be returned if mode=all or mode=best; this is a backwards compatible feature and it is recommended that the ExtractNIRImages service be used if NIR images are expressly desired.

 

Output Image Specifications:

  • 8-bit depth

  • 3-band (RGB)

  • 7.5 or 20 cm centimeter resolution (layer dependent)

  • Nadir and Oblique imagery available

  • Blue Sky and Gray Sky imagery available

  • Jpeg image format

  • Output Format: Jpeg images in a compressed folder

    • Folder Name: {layer parameter}.zip

    • Image Name: variable, dependent on layer

    • Metadata in a variety of formats with many attributes

Base URL

The ExtractImages service responds to the following base URL: https://api.gic.org/images/ExtractImages/{layer}/

  • Base URL with only mandatory parameters:

    • Lat/Lon Coordinate Point
      https://api.gic.org/images/ExtractImages/{layer}?mode={mode}&zoom={zoom}&EPSG={EPSG}&token={token}&xcoordinate={xcoordinate}&ycoordinate={ycoordinate}

    • wkt Polygon Area
      https://api.gic.org/images/ExtractImages/{layer}?mode={mode}&zoom={zoom}&EPSG={EPSG}&token={token}&wkt={wkt}

  • Base URLs with all parameters defined:

    • Lat/Lon Coordinate Point
      https://api.gic.org/images/ExtractImages/{layer}?mode={mode}&zoom={zoom}&EPSG={EPSG}&token={token}&xcoordinate={xcoordinate}&ycoordinate={ycoordinate}&width={width}&height={height}&imagename={imagename}&projCode={projCode}&childAOI={childAOI}&initDate={initDate}&endDate={endDate}&nadirRotatedNorth={nadirRotatedNorth}&orientation={orientation}&metadata={metadata}&excludeJGWfiles={excludeJGWfiles}&drawing={drawing}&logo={logo}&demPriority={demPriority}

    • wkt Polygon Area
      https://api.gic.org/images/ExtractImages/{layer}?mode={mode}&zoom={zoom}&EPSG={EPSG}&token={token}&wkt={wkt}&crop={crop}&imagename={imagename}&projCode={projCode}&childAOI={childAOI}&initDate={initDate}&endDate={endDate}&nadirRotatedNorth={nadirRotatedNorth}&orientation={orientation}&metadata={metadata}&excludeJGWfiles={excludeJGWfiles}&drawing={drawing}&logo={logo}&demPriority={demPriority}

Parameters

Parameter

Parameter Type

Data Type

Description

Format Example

Notes

Parameter

Parameter Type

Data Type

Description

Format Example

Notes

Mandatory Parameters:

layer

Ordered REST

String

Layer of the requested image.

bluesky-ultra-g
Urban data collected by Geomni (7.5 GSD)

bluesky-ultra
Urban data collected with Osprey (7.5cm GSD)

bluesky-ultra-europe
Urban data collected with Osprey in Europe (7.5 GSD)

bluesky-ultra-oceania
Urban data collected with Osprey in Oceania (7.5 GSD)

bluesky-ultra-japan

Urban data collected with Osprey in Japan (7.5 GSD)

urban-r

Urban data collected with Condor (7.5 GSD)

bluesky-high
Wide area data collected with Condor (15cm GSD)

bluesky-high-europe
Wide area data collected with Condor in Europe (15cm GSD)

graysky-g
Gray Sky events collected by Geomni

graysky
Gray Sky events collected with Ultracam sensors

/bluesky-ultra-g/

The layer parameter must be defined within the URL as an ordered REST parameter rather than a Key-Value pair. This is the only layer that must be defined in this manner.

mode

Key-Value-Pair

string

 Indicates the work mode of the service request.

all
All the available images in the area from a single camera orientation.

best
One image from each camera orientation, each with best coverage over the input area. See the note to the right for more info on best coverage.

one
Only the image as defined in imagename parameter. If imagename is undefined, mode=best will be used instead.

mode=all

If you specify all you must include a single-value orientation parameter.

Definition of mode=best:
Images are defined as best depending on the method of defining an input area:
- lat/lon - The image with a center point closest to the input coordinate is considered best
- wkt polygon - The image that covers the most of the input polygon is considered best

In both cases, if there are multiple images which meet the best criteria, the most recent image will be returned.

zoom

Key-Value-Pair

Integer

 The zoom level of the returned images.

0 = Full Resolution
1 = 1/4 Resolution
2 = 1/16 Resolution
3 = 1/64 Resolution - Maximum zoom

zoom=2



EPSG

Key-Value-Pair

Integer

The EPSG code determines the projection of the provided coordinates or polygon.

EPSG=4326

token

Key-Value-Pair

String

Authentication token received from Login service. Specific to each individual user.

token={token}

Mandatory - Method of defining area: Lat/Lon Coordinates or Polygon. Only one method can be used per URL call.

  • Lat/Lon Coordinates

xcoordinate

Key-Value-Pair

double

The longitudinal decimal degree coordinate for the desired point, represented by the EPSG projection defined by the EPSG parameter.

xcoordinate=-93.4251

ycoordinate

Key-Value-Pair

double

The latitudinal decimal degree coordinate for the desired point, represented by the EPSG projection defined by the EPSG parameter.

ycoordinate=44.9186



  • Polygon

wkt

Key-Value-Pair

string

The “well-known text” field is used to define a polygon around the desired area.

wkt=POLYGON((-93.41947148592193 44.91507523063691,-93.4185112550946 44.91507523063691,-93.4185112550946 44.91431925758581,-93.41947148592193 44.91431925758581,-93.41947148592193 44.91507523063691))

Optional Parameters

width (will only work with a pair of Lat/Lon coordinates)

Key-Value-Pair

Integer

The width (in pixels) defining the east/west extent of a rectangle centered on the lat/lon coordinate point. Images intersecting the rectangle will be returned, cropped by the rectangle extent. If not specified, full image(s) intersecting the lat/lon coordinate point will be retrieved.

width=400

height (will only work with a pair of Lat/Lon coordinates)

Key-Value-Pair

Integer

The height (in pixels) defining the north/south extent of a rectangle centered on the lat/lon coordinate point. Images intersecting the rectangle will be returned, cropped by the rectangle extent. If not specified, full image(s) intersecting the lat/lon coordinate point will be retrieved.

height=400

crop (will only work with a wkt polygon)

Key-Value-Pair

string

The method with which to crop the returned images based on the input wkt parameter.

crop- Default value if wkt is provided - Crops the image(s) to the minimum bounding rectangle of the wkt polygon values.

exact - Crops the image(s) to the exact shape of the wkt polygon.

full - Default value if no wkt is provided - Whole image(s) which intersect the wkt polygon will be returned.

wkt polygon:

crop=boundingBox

imagename

Key-Value-Pair

string

Only the image referred to by this parameter will be downloaded.

imagename=2018~n30w88-n30w89-us-al-mobile-2018~nadir~200531-lvl02-rgbi

projCode

Key-Value-Pair

string

The AOI identifier or project name that contains the delivered images.

projCode=us-la-marrero-2019

bluesky-ultra-g: aoi=us-al-tuscaloosa_leica-2020

bluesky-ultra: aoi=us-az-avondale-2021

bluesky-ultra-europe: aoi=it-62-rome-2020

bluesky-ultra-oceania: aoi=au-qld-sunshinecoast-2019

bluesky-ultra-japan: aoi=jp-20-matsumoto-2022

urban-r: aoi=us-ok-oklahomacity_rf01-2023

bluesky-high: aoi=USUSCON2001

bluesky-high-europe: aoi=EUEUCON2001

graysky-g: aoi=USMSCOL1902

graysky: aoi=us-la-neworleans-tornado-2022

childAOI

Key Value Pair

string

The identifier of the child Area of Interest (AOI) which contains the desired imagery. This parameter can only be used in combination with the projCode parameter in cases where the AOI contains several smaller collection regions; for many Blue Sky AOIs there is no child AOI. This parameter can be especially useful for Gray Sky events.

childAOI=

format

Key-Value-Pair

String

The image file format.

format=jpeg

 

initDate

Key-Value-Pair

String

No images collected before this date will be delivered.

initDate=2019-01-01T00:00:01+00:00

endDate

Key-Value-Pair

String

No images collected after this date will be delivered.

endDate=2021-01-01T00:00:01+00:00

nadirRotatedNorth

Key-Value-Pair

string

Determines the rotation of the image (Nadir images only):

nadirRotatedNorth=yes

orientation

Key-Value-Pair

string

The camera-axis and/or cardinal orientation of the images to be delivered.

orientation=NADIR

metadata

Key-Value-Pair

string

The type of metadata schema to be delivered along with the images. Metadata and images are delivered in the same zip file.

metadata=json

excludeJGWfiles

Key-Value-Pair

boolean

The JGW file contains the information needed to georeference a JPEG image. JGW files are only available when area is defined by wkt. To exclude all JGW files, set excludeJGWfiles = true

excludeJGWfiles=true

dst_height

Key Value Pair

Integer

The combination of dst_height and dst_width is used to define the size and aspect ratio of a destination frame. The input geometry will be centered within the destination frame with additional imagery extending either vertically or horizontally to fill the destination frame if necessary.

dst_height=600

 

dst_width

Key Value Pair

Integer

The combination of dst_height and dst_width is used to define the size and aspect ratio of a destination frame. The input geometry will be centered within the destination frame with additional imagery extending either vertically or horizontally to fill the destination frame if necessary.

dst_width=800

 

drawing

Key-Value-Pair

string

The signal to be drawn in the delivered images as a marker of the requested x/y coordinate point (or wkt center point).

drawing=cross

logo

Key-Value-Pair

string

A watermark will be drawn on the bottom of the image(s). By default, the logo will not be printed.

logo=yes



demPriority

Key-Value-Pair

string

A digital elevation model (DEM) is used during the world to pixel projection. This parameter allows the user to select the desired elevation model(s) with which to perform the projection. Multiple DEMs may be selected; values separated by comma. By default this service will select the most accurate available DEM.

demPriority=vexcel_dsm,flat_dtm

Optional - Drawing Elements (POST request)

The ExtractImages service allows for the inclusion of custom drawing elements using a POST request. A POST request takes typical REST parameters (defined within the URL) but adds JSON elements in the body of the POST call to define the drawing elements.

Drawing Element Parameters

  • drawingPolygon - The polygon to be draw in WKT format (The EPSG has to be the same EPSG that is in the head of the petition)

  • lineWidth - The width for the polygon’s exterior line

  • outlineColor - The color for the polygon’s exterior line (RGB format)

  • fillColor - The color for the polygon’s fill

  • drawingPointList - An object list of point(s) and associated label(s)

    • point - The point coordinates in latitude and longitude (decimal degrees).

    • label - The custom label for each point.

  • fontSize - Font point size for labels

  • fontColor - Font color for labels (RGB color)

  • fontType - Font typeface (Options: Monospaced, SansSerif or Serif)

JSON format:

{ "drawingPolygon": "[polygon wkt]", "lineWidth": "[linewidth]", "outlineColor": "[rgb]", "fillColor": "[rgb]", "drawingPointList": [ { "point": "[point wkt]", "label": "[custom text]" }, { "point": "[point wkt]", "label": "[custom text]" } ], "fontSize": "[font point size]", "fontColor": "[rgb]", "fontType": "[font typeface]" }

Examples

Eden Isle/Lake Pontchartrain, Louisiana, USA - Demonstrating mode=one, epsg, imagename, childAOI, and metadata:

REST URL:
https://api.gic.org/images/ExtractImages/bluesky-high?mode=one&EPSG=4326&zoom=2&xcoordinate=-89.793687&ycoordinate=30.211780&childAOI=n30w89-us-ms-gulfport-2023&imagename=2023~n30w89-us-ms-gulfport-2023~images~NN_20230213_204838_149_38822E189B5AE89_rgb&metadata=xm8&orientation=NN&token={token}

Image:

Metadata (xm8):
<?xml version="1.0" encoding="UTF-8" ?>
<IMGS>
<IMG name="2023~n30w89-us-ms-gulfport-2023~images~NN_20230213_204838_149_38822E189B5AE89_rgb" id="NN" xScale="0.14947796595723" yScale="0.14977664463805" lat="30.20827209" lng="-89.80026086" ulLat="30.2124617" ulLng="-89.83795553" lrLat="30.20408843" lrLng="-89.76272982" dt="13-02-23" header="0.062590282725012" />
</IMGS>

________________________________________________________________________________________

Audubon Zoo, New Orleans, Louisiana, USA - Demonstrating mode=best, excludeJGWfiles, projcode, nadirRotatedNorth

REST URL:
https://api.gic.org/images/ExtractImages/bluesky-ultra?mode=best&EPSG=4326&zoom=0&xcoordinate=-90.131992&ycoordinate=29.922790&metadata=csv&excludeJGWfiles=true&projcode=us-la-marrero-2019&nadirRotatedNorth=yes&height=800&width=1200&token={token}

Images:

Oblique (North Up)

2019~us-la-marrero-2019~images~N_20190415_181120_50_2DD7DCBDF44C364_rgb_extract.jpg

 

Oblique (South Up)

2019~us-la-marrero-2019~images~S_20190416_150102_50_2DD7DCBDF6860D3_rgb_extract.jpg

 

Oblique (East Up)

2019~us-la-marrero-2019~images~E_20190415_184727_50_2DD7DCBF5C3578D_rgb_extract.jpg

Oblique (West Up)

2019~us-la-marrero-2019~images~W_20190415_190613_50_2DD7DCBD7CA9D6F_rgb_extract.jpg

Nadir (North Up)

2019~us-la-marrero-2019~images~NE_20190415_190631_75_2DD7DCBD7CB8249_rgb_extract.jpg

Nadir Infrared (North Up)

2019~us-la-marrero-2019~images~NE_20190415_190631_75_2DD7DCBD7CB8249_irg_extract.jpg

________________________________________________________________________________________

St. Louis Cathedral, New Orleans, Louisiana, USA- Demonstrating mode=all, drawing, crop, logo , initdate, endDate

REST URL:
https://api.gic.org/images/ExtractImages/bluesky-ultra-g?mode=all&EPSG=4326&zoom=0&wkt=POLYGON((-90.06387401262296 29.958257707138394,-90.06340060273183 29.957938178957885,-90.06359103957189 29.957713927657917,-90.06407517829908 29.958033456559164,-90.06387401262296 29.958257707138394))&metadata=json&orientation=nadir&drawing=cross&logo=yes&crop=crop&initdate=2019-01-01T00:00:01+00:00&enddate=2019-02-01T00:00:01+00:00&token={token}

Images:

2019~us-la-neworleans_leica-2019~images~NE_20190110_163023_48_2DD7DD3A2040284_rgb_extract.jpg

2019~us-la-neworleans_leica-2019~images~NE_20190110_163025_48_2DD7DD3A304564D_rgb_extract.jpg

2019~us-la-neworleans_leica-2019~images~NE_20190110_163028_48_2DD7DD3A6115E89_rgb_extract.jpg

2019~us-la-neworleans_leica-2019~images~NW_20190110_164305_48_2DD7DD3ACF67889_rgb_extract.jpg

2019~us-la-neworleans_leica-2019~images~NW_20190110_164307_48_2DD7DD3A9F293D6_rgb_extract.jpg

2019~us-la-neworleans_leica-2019~images~NW_20190110_164309_48_2DD7DD3A8E3DE16_rgb_extract.jpg

Metadata (json):

[{"requested_point_wkt":"POINT(6363.52462580043 -253.32698344845696)","gsd":0.04830813917366818,"image_id":"2019~us-la-neworleans_leica-2019~images~NE_20190110_163023_48_2DD7DD3A2040284_rgb","processing_date":"2021-08-16T15:12:58","processing_toolset_version":"3.3.0","capture_date":"2019-01-10T16:30:23","original_image_name":"2019/2D/D7/DD/3A/NE_20190110_163023_2DD7DD3A2040284.amf","original_shot_id":"001_0026_00000659","flight_line_id":"0026","utm_zone":"15N","camera_pos_x":783181.178,"camera_pos_y":3317810.144,"camera_z":772.7490234375,"ground_z":1.6775130033493042,"omega":-7.74E-4,"phi":-0.001358,"kappa":-1.548663,"centre_wkt":"POINT(-90.06574562 29.95849691)","centre_wkt_latlon":"POINT(-90.06574562 29.95849691)","bbox_wkt":"POLYGON((-90.06378945 29.96074132,-90.0638081 29.95624155,-90.06770313 29.95625081,-90.06768486 29.96075416,-90.06378945 29.96074132))","bbox_wkt_latlon":"POLYGON((-90.06378945 29.96074132,-90.0638081 29.95624155,-90.06770313 29.95625081,-90.06768486 29.96075416,-90.06378945 29.96074132))","orientation":"NE","projectname":"us-la-neworleans_leica-2019","copyrightsentence":"VEXCEL","processingcenter":"","layername":"bluesky-ultra-g","dtmfile":"","cameratechnology":"LEICA","projectext":"us-la-neworleans_leica-2019","raster_size_width":10336.0,"raster_size_height":7788.0,"pixel_size":0.0052,"focal_length":83.0,"pp0_x":0.0,"pp0_y":0.0,"k0":0.0,"k1":0.0,"k2":0.0,"k3":0.0,"p1":0.0,"p2":0.0,"b1":0.0,"b2":0.0,"camera_name":"04P2_JPEG_NONROTATED_CAM1_DOWN","id":500108028,"max_zoom":0,"min_zoom":3,"tile_size_x":256,"tile_size_y":256,"relationPolygonInImage":0.0,"relationImageInPolygon":0.0},{"requested_point_wkt":"POINT(9129.66676285408 106.58775649201783)","gsd":0.04803211496846422,"image_id":"2019~us-la-neworleans_leica-2019~images~NW_20190110_164305_48_2DD7DD3ACF67889_rgb","processing_date":"2021-08-16T15:13:01","processing_toolset_version":"3.3.0","capture_date":"2019-01-10T16:43:05","original_image_name":"2019/2D/D7/DD/3A/NW_20190110_164305_2DD7DD3ACF67889.amf","original_shot_id":"001_0027_00000903","flight_line_id":"0027","utm_zone":"15N","camera_pos_x":783560.338,"camera_pos_y":3317576.657,"camera_z":770.7069702148438,"ground_z":4.041303634643555,"omega":8.19E-4,"phi":0.00143,"kappa":-4.687188,"centre_wkt":"POINT(-90.06190496 29.95631654)","centre_wkt_latlon":"POINT(-90.06190496 29.95631654)","bbox_wkt":"POLYGON((-90.06384333 29.95407833,-90.06384611 29.95856177,-90.059971 29.95854956,-90.0599692 29.95407738,-90.06384333 29.95407833))","bbox_wkt_latlon":"POLYGON((-90.06384333 29.95407833,-90.06384611 29.95856177,-90.059971 29.95854956,-90.0599692 29.95407738,-90.06384333 29.95407833))","orientation":"NW","projectname":"us-la-neworleans_leica-2019","copyrightsentence":"VEXCEL","processingcenter":"","layername":"bluesky-ultra-g","dtmfile":"","cameratechnology":"LEICA","projectext":"us-la-neworleans_leica-2019","raster_size_width":10336.0,"raster_size_height":7788.0,"pixel_size":0.0052,"focal_length":83.0,"pp0_x":0.0,"pp0_y":0.0,"k0":0.0,"k1":0.0,"k2":0.0,"k3":0.0,"p1":0.0,"p2":0.0,"b1":0.0,"b2":0.0,"camera_name":"04P2_JPEG_NONROTATED_CAM1_DOWN","id":500160892,"max_zoom":0,"min_zoom":3,"tile_size_x":256,"tile_size_y":256,"relationPolygonInImage":0.0,"relationImageInPolygon":0.0},{"requested_point_wkt":"POINT(6380.176067060465 2737.1243125744213)","gsd":0.04818624368564959,"image_id":"2019~us-la-neworleans_leica-2019~images~NE_20190110_163025_48_2DD7DD3A304564D_rgb","processing_date":"2021-08-16T15:12:58","processing_toolset_version":"3.3.0","capture_date":"2019-01-10T16:30:25","original_image_name":"2019/2D/D7/DD/3A/NE_20190110_163025_2DD7DD3A304564D.amf","original_shot_id":"001_0026_00000660","flight_line_id":"0026","utm_zone":"15N","camera_pos_x":783321.338,"camera_pos_y":3317813.899,"camera_z":771.6669921875,"ground_z":2.5410966873168945,"omega":-7.36E-4,"phi":-0.001336,"kappa":-1.548631,"centre_wkt":"POINT(-90.0642941 29.95849869)","centre_wkt_latlon":"POINT(-90.0642941 29.95849869)","bbox_wkt":"POLYGON((-90.06234121 29.96073943,-90.06236517 29.95625339,-90.06624695 29.95625786,-90.06622935 29.96075119,-90.06234121 29.96073943))","bbox_wkt_latlon":"POLYGON((-90.06234121 29.96073943,-90.06236517 29.95625339,-90.06624695 29.95625786,-90.06622935 29.96075119,-90.06234121 29.96073943))","orientation":"NE","projectname":"us-la-neworleans_leica-2019","copyrightsentence":"VEXCEL","processingcenter":"","layername":"bluesky-ultra-g","dtmfile":"","cameratechnology":"LEICA","projectext":"us-la-neworleans_leica-2019","raster_size_width":10336.0,"raster_size_height":7788.0,"pixel_size":0.0052,"focal_length":83.0,"pp0_x":0.0,"pp0_y":0.0,"k0":0.0,"k1":0.0,"k2":0.0,"k3":0.0,"p1":0.0,"p2":0.0,"b1":0.0,"b2":0.0,"camera_name":"04P2_JPEG_NONROTATED_CAM1_DOWN","id":500108040,"max_zoom":0,"min_zoom":3,"tile_size_x":256,"tile_size_y":256,"relationPolygonInImage":0.0,"relationImageInPolygon":0.0},{"requested_point_wkt":"POINT(9170.73266622357 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