layers (optional): List of layers to be exported.For map services that don't use dynamicLayers, only layerDefinition in the layers property is supported. Note that if a map service supports dynamic layers, then layers takes precedence over visibleLayers. You don't need to specify group layer's Id. Is drawn with the default visible states of each If this is omitted, the operational layer visibleLayers (optional): Array of sublayer IDs that should be made visible within the map service layer.
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A user name and password are not supported as part of the URL. In case of secured layers, specify the token in a layer definition. There are some properties common to all types of operational layers, while others are specific to each type of operational layer. For example, a WMS layer requires that you specify "type": "wms". If the resource cannot be determined from the URL, the type property defines the type. The type of each layer is defined by the URL resource response. The order of the array defines the order of the layers in the map. The operationalLayers list contains all the operational layers to be displayed in the map. When there are more than one maps in a layout, this is applied to the map associated to a map frame named WEBMAP_MAP_FRAME. background (optional): You can change the map's background color.Add two elements ( startTime followed by endTime) to represent a time extent, or provide only one time element to represent a time instant. This order list can have one or two elements. time (optional): If there is a time-aware layer and you want it to be drawn at a specified time, specify this property.The order of preference when spatialReference is missing is as follows: spatialReference (optional): The spatial reference of the map.Rotated, measured counterclockwise from the north. rotation (optional): This represents the number of degrees by which the data frame will be.When scale is used, it takes precedence over the extent, but the output map is drawn at the requested scale centered on the center of the extent. Output map will be different and you could see differences inįeatures and/or symbols in the web application Size of the output map (for example, 8.5 x 11 in. Map that you are viewing on the web app may be smaller than the Web map have scale-dependent layers or reference scales set. The scale property isĮspecially useful when map services in this This property is optional but recommended for getting optimal results. scale (optional): The map scale at which you want your map to be exported.When the aspect ratio of the map extent is different than the size of the map on the output page or the exportOptions:outputSize, you might notice more features on the output map. The spatial reference of the extent object is optional when it is not provided, it is assumed to be in the map's spatial reference. extent (required): A required property that defines the extent of the map.Those are your options if you use any value other than exactly 255, for integers 0.255: Either an increase in average round-trip error, or non-uniformly-spaced values in the float domain.
Or perhaps 0 to 1/8, 3 to 7/8! In the diagram above, it should take you from middle line back to top line.)īut now you will have the difficult-to-defend situation that you have taken equally-spaced byte values, and converted them to non-equally-spaced float values. (Per byte value, it should return the midpoint of the float values which became that byte value. If you strongly believe in one of the 256 formulas, then I'll leave it to you to determine the optimal inverse formula. The only way to avoid this increased error, is to use some different formula when going from byte to float. Notice the interval boundaries of last line are different than first line. Notice the uneven spacing of the first line: 0.3/8, 3/8.5/8, 5/8.1. 1.0 is the only case that can go wrong, so handle that case separately: b = floor(f >= 1.0 ? 255 : f * 256.0)Īlso, it might be worth forcing that f really is 0= 1.0 ? 255 : (f byte 1 => float 1/3 ~= 0.333, for error | 0.33-0.18| = 0.147 using a 256 formula => byte 0 => float 0, for error 0.18, which is an increase from the optimal error 0.147.ĭiagrams using * 4 with / 3.
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