Latest Contributions by OwenEarley

Do you have any raster data loaded? The Spatial Analyst toolbar appears to stay greyed out unless there is some data it can use. For example - before adding some raster data: After adding some raster data: This can be confusing as the greyed out toolbar appears exactly as it would if the extension was not enabled in Customize > Extensions. ... View more

The Geographic Conversion refers to a datum transformation. However, if both your source data and your desired projection use the same datum this is not required. This is why there is no GCS_WGS_1984 to WGS 1984 option. One issue is that your Lamberts projection file does not specify a known datum. ArcMap sees that the source data and target projection require a datum transformation but cannot locate an appropriate one. If you modify your Lamberts projection file to use WGS84 as the underlying geographic coordinate system then the project tool works as it does not require a datum transformation. However, the results may not be quite what you are after: There are other equal area world projections that use WGS84 that may be more suitable, for example: World_Behrmann (WKID: 54017 Authority: ESRI) World_Cylindrical_Equal_Area (WKID: 54034 Authority: ESRI) These are available within ArcMap (Projected Coordinate Systems > World). The list of supported map projections in the ESRI help has more information on each of these and others. As an example, the World Behrmann projected data looks like this: Melita Kennedy‌ may be able to suggest the best projection to use. Hope this helps. Owen Spatial XP ... View more

Hi Franky, Note that map levels are predefined scales at which tiled images are created. For example: Level Scale 1 16,000,000 2 8,000,000 3 4,000,000 4 2,000,000 etc This is important as the map level value increases as you zoom in. However, the map scale value decreases as you zoom in. To use dynamic map layers and map scale you will need to change the streetLvlZoom variable to a scale value and also update the map click and zoom-end handler functions. var streetLvlZoom = 5000; Also, change the way you create the map: map = new Map("mapDiv", {          center: [151.15,-33.86],   scale:250000 // Use scale when creating the map }); Modify the map click handler to test the map scale and not the zoom level: // Zoom in to local area map.on("click", function(e){     // Notice that this is now a 'greater than' test     if (map.getScale() > streetLvlZoom){         map.centerAt(e.mapPoint);         map.setScale(streetLvlZoom);     } }); Modify the map zoom-end handler to test the map scale and not the zoom level: // Check if draw buttons should be enabled when zoom level changes map.on("zoom-end", function(e){   var scale = Math.floor(map.getScale())   var drawBtns = document.getElementById("draw-btns").children;   for(var i = 0; i < drawBtns.length; i++) {   // disable btns if map scale > minimum required scale   drawBtns.disabled = (scale > streetLvlZoom);   } }); As mentioned previously the map level value increases as you zoom in. However, the map scale value decreases as you zoom in. This means that when checking to disable buttons - instead of checking if the zoom level is less than the streetLvlZoom, you need to check if the map scale is greater than the streetLvlZoom. Also, note the use of the floor function. I have noticed that when setting the map scale to 1:5000 and then checking map.getScale() you end up with a value like 1:5000:000000000704. This ends up messing with the scale > streetLvlZoom test and the buttons remain disabled. This should fix the problem where the zoom is going in the opposite direction. This modified example should work even if you also use a tiled base map with your dynamic map service layer. Example using tiled map service basemap. Example using dynamic map service basemap. Owen ... View more

Hi Franky, Check out this example that I created (based on an ESRI sample): Zoom-in Draw‌ The key parts to do what you are after are: 1. Set the minimum zoom level to enable the draw buttons: // Set the zoom level to enable draw buttons var streetLvlZoom = 17; 2. Create a map click event to zoom in to a locality: // Zoom in to local area map.on("click", function(e){     if (map.getLevel() < streetLvlZoom){         map.centerAndZoom(e.mapPoint, streetLvlZoom)     } }); 3. When the map zoom level changes check if you should enable the draw buttons: // Check if draw buttons should be enabled when zoom level changes map.on("zoom-end", function(e){     var drawBtns = document.getElementById("draw-btns").children;     for(var i = 0; i < drawBtns.length; i++) {         drawBtns.disabled = (e.level < streetLvlZoom);     } }); Hope this helps to outline the process. Owen Spatial XP ... View more

No problem Peter - can you please mark this question as answered. ... View more

Also forgot to mention: Could the problem be in line #181 "if (selection.length > 0) {" I mean, it makes no sense for point but you would think it would work for line that do have a "length". The selection.length in this case is the number of selected features. Length in JavaScript refers to the number of items in a list/array. This is not related to the length of line features. ... View more

As I notice that even the map is just initialized, the length of map.graphics.graphics is always greater than 0, since there is one point object with x,y = 0,0. Why do I get this point? I have never noticed that before. However, after running a quick test I can confirm that there is a single graphic in the graphics layer of a brand new map. Can someone at ESRI comment on this? - Jim Barry‌ ... View more

Lukas - firstly, I would encourage you to persist with using GIS as it is such a useful tool in so many ways. In regards to the projection problem - It sounds like ArcMap does not know what coordinate system your data is in. If you view the layer properties for your data points can you check if the coordinate system: If this has not been assigned to the layer then ArcMap will not know how to project the data or do on-the-fly transformations. If this is the case the Coordinate System will show <Undefined>. You can use the Define Projection tool to assign the WGS 1984 Geographic Coordinate System to this layer (ArcToolbox: Data Management Tools > Projections and Transformations > Define Projection). After defining the projection the layer properties should have been updated: You should now be able to project your data points to S-JTSK using the Project tool (ArcToolbox: Data Management Tools > Projections and Transformations > Feature >Project): ... View more

I totally agree Jeff. The momentum shift from proprietary solutions to html/js has been huge in the past few years. Despite the issues with html/js it has a huge amount of flexibility. I just wish all browsers could just handle things in a consistent way... ... View more