I have an asset management job where I constantly need to edit the geometry of point-feature objects stacked vertically, spacing them in the z direction relative to one another. As a subcontractor, I cannot customise the lightly modified ArcGIS Pro installations I use beyond standard user settings, nor can I run any scripts or code. The data sets are huge, and the servers are overburdened, leading to terrible lag and slow selections.
Is there any way I can preserve my selections when editing geometry? The "create layer from selection" has been disabled in our ArcGIS Pro copies, and the need to constantly re-select objects is maddening.
Related
I was trying to make distance based agent(people) connection. It was working in a continuous space (see attached). But not working in GIS space. In GIS space we don't have option to select network type under "space and network type". So, I have created a function to do that. That function is also working perfectly in continuous space but not in GIS space. Anybody can explain why it is happening or is there any way to do it GIS space.
My GIS space has 190 regions and random number of people located randomly (uploaded from database) in each region.
You need to define networks and connections yourself, the option you used so far is only a little helper, but the actual capabilities are much larger, also in GIS:
Just use the custom "Agent Link" object and its properties. It is designed to connect agents in any space, also GIS.
Check the help and example models to learn all about it, it is worth it :)
I have to create a fictional map as a visual representation for a particular community in a video game that I would not disclose.
The map would have multiple landmarks that requires to be drawn a radius around it, creating a circle. This circle should change in color depending on certain events that occurred, often monthly.
The reason why it is in Google Sheets was the data that is being collected from the game is needed to be calculated and graphed alongside the said interactive map.
I can confidently say that no one have perform this sort of thing with Google Sheets before.
My skills are essentially beginner-level, so if there are some topics that are outside the scope of general amateur skillset, please describe it for me.
I first thought that I could simply overlap images together, but images in Google Sheets can't change it's position in the sheets through the app-script, like placing it in a coordinate system. Because there are many landmarks that are needed to be drawn a circle around with multiple different kinds of color existing in the palette, it's not exactly a good idea to have all possible combination of different landmarks or color of the circle and then display one correct one out of hundreds of possibility.
Changing the color can be manually be dealt by hand, as monthly changes are not difficult to perform.
If there are other more suitable program for this job, please let me know!
What you have is GIS data (see GIS community at Stack Exchange), and you need to visualize it.
I don’t know what kind of raw data you have but you can probably load it directly to a GIS program like QGIS (link to site) to visualize it, or even do things like heat maps or aggregations without need of programming.
If it doesn’t have an specific functionality that you need and there’s no plugin that does so, you can also make a content service (see documentation on how to do so) that returns a GeoJSON with points on the landmarks with the computed data as extra information. Then I’d use the program to visualize it. This obviously requires programming.
If for some reason you cannot install a program, you could also make a WebApp (see documentation on how to do so) and use a GIS library (Leaflet, for example) to make a visualizate of the data. In this case the data would be fetched via google.script.run. This requires even more programming.
References
Content Service (Google Developers)
HTML Service: Create and Serve HTML (Google Developers)
google.script.run (Google Developers)
QGIS webpage
Leaflet webpage
Is it possible to speed up mapping with OSM by removing features and details (minor roads, bus stops, etc) -- or is that somewhat irrelevant to the tile download and rendering process.
aka, Are the SVG details added/removed on client or server side.
Further how are those 'church: invisible' type of instructions set
TIA
Perhaps that is a general mapping question; given that an engine (possibly) operates in much the same way at least when it comes to tiles and SVG details. And I simply don't know that process.
It is not quite clear about which specific process your are talking.
The tiles you see on http://openstreetmap.org are PNG, not SVG. The share menu allows to export the current view to SVG and some other formats. This resulting SVG is created server-side. Of course using less detail would speed up the SVG creation process But this process involves several other operations like querying the data base which won't benefit much from reduced details (ignoring the time to transfer the data between the database and the SVG creation process).
The PNG rendering will also depend somehow on the amount of detail but likewise there are a lot more operations necessary for rendering a single tile. I don't expect a large speedup by removing a few features.
Also note that there are several different renderers available and each will behave differently. And there is also the possibility of creating vector tiles which move some of the tile creation load from the server-side to the client-side. Here the amount of detail will slightly influence the server-side and significantly more the client-side, especially low-end systems.
Still I have no idea what these things have to do with mapping - the process of editing maps and adding/updating information.
I have data that I want to create a GIS type application that will have the typical features of adding and removing layers of different types. What is the best architectural approach?
The data consists of property locations in Eastings and Northings.
I also have ordnance survey data in GML and Shapefiles.
I know this is a very broad question but the subject area also seems very broad to me and I am unsure which direction to go.
I was thinking of using SQL 2008 spatial and Bing Silverlight control to visualise that maps.To do this would I have to convert the eastings and northings to GWS84 geography datatype? But then if I converted the shapefiles to GML and imported all the GML files to sql using GeomFromGML they would be in geometry datatypes. Wouldn’t the two types be incompatible?
Also, should ESRI ArcGIS API for Silverlight
feature in the equation? Is this a good environment to create maps that I can point as SQL sqerver 2008 as the datasource (using a WCF service if necessary)?
Any advice greatly appreciated!
This is something I've done several times, using OS data from SQL Server in both Bing Maps AJAX and Silverlight controls. Some general comments below (in no particular order!):
Don't expect to implement full-blown
GIS functionality using Bing Maps.
Simple querying, retrieval and
display of the data is all fine (+
some simple editing), but after that
you'll be struggling with what can be
achieved in the browser.
All vector shapes supplied to Bing Maps need to be in (geography)
WGS85 coordinates, EPSG:4326.
However, all data will be projected
and displayed using (projected)
Spherical Mercator system, EPSG:3857.
In terms of vector shapes, you can expect to achieve a similar level of performance as you get in the SSMS spatial results tab - that is, (with careful architecture) you can plot up to about 5,000 features on the map at once, zoom / pan around them, click on them to bring up various properties and attributes etc. However, after that you'll find the UI becomes fairly unresponsive (which
I imagine is the reason why the spatial results tabs itself limits you to displaying 5,000 records at once).
If you want to display more features than this, one approach is to rasterize them by projecting them into the EPSG:3857 projection, creating a .PNG/.JPG image file of the features and then cutting that image into tiles according to the Bing Maps quadkey tile numbering system as explained here:
http://msdn.microsoft.com/en-us/library/bb259689.aspx and displaying them as a tilelayer. Tile layers are significantly faster than displaying the equivalent vector shapes, although it means the data is static.
If you do create raster tiles, you can either render them dynamically
or pre-render them to improve performance - i.e. you could set
up a job to render and update the tileset for slowly-changing data
every night/every month etc.
If you're talking about OS Mastermap data, the sheer level of detail
involved means that you need to think more carefully about what
features you want to display, and how you want to display them. Take
greater London, for example, which covers an area about 50km x 40km. To
create raster tiles (each of which are 256px x 256px) at zoom level 19
covering this area you'd need to render and store 1.3 million separate
tiles. If each of those is generated from a database query that takes, say
200ms to run, it's gonna take a looooonggggg time to prepare all your
data. Also, once the files have been generated, you might want to think
about storing them in a DB rather than saving them on a file system.
As for loading the OS data into SQL Server in the first place - there
are several tools that will import either from GML or shapefile into SQL
Server, and handle the projection from EPSG:27700 (Ordnance Survey
National Grid) to WGS84 along the way. Try GDAL/OGR or Safe FME for
starters.
I have a blog at http://alastaira.wordpress.com that has several blog posts that you may find useful describing various aspects of integrating Bing Maps and SQL Server. Particularly, you might want to look at:
http://alastaira.wordpress.com/2011/02/16/loading-ordnance-survey-open-data-into-sql-server-2008/
http://alastaira.wordpress.com/2011/01/23/the-google-maps-bing-maps-spherical-mercator-projection/
http://alastaira.wordpress.com/2011/02/21/using-ogr2ogr-to-convert-reproject-and-load-spatial-data-to-sql-server/
I am trying to take a shapefile of subdivisions within a county that I have created and line it up with another shapefile that was given to me by the County Appraisal District (parcel data). When I try to get them to line up then my streets shapefiles is not aligned with everything else. They are all on the same coordinate system and I do not want to have to recreate the shapefile for the subdivisions. Any thoughts?
This is a question with answers that may be simple or may be very complex, depending on your situation. As a GIS developer, I've most commonly seen this as a symptom of an incorrectly defined coordinate system. However, whether this is the case or not, and what the solution is strongly depends on your environment. From here on, I'll assume that you're working in an ESRI package...
I agree with the other posters that your problem is one of mismatching projections and/or datum definitions.
The most important thing to understand as regards projections in ESRI software is this:
Manually setting the projection of a dataset (shapefile, geodatabase feature class, etc) in ArcCatalog does NOT reproject that dataset!!!
In order to reproject your data, you must EXPORT the data from an ArcMap session in which you've been working and where the data is obviously lined up correctly. During the EXPORT, you are given the choice of saving your data with the coordinate system of the underlying map or that of the original dataset.
Your best bet is to follow these steps to create a new dataset with the correct projection and then extrapolate what you need to do to fix your specific problem:
Create a new ArcMap session and set its coordinate system:
Do this in a fresh ArcMap session with NO OTHER DATA. Be sure to explicitly set the coordinate system of the ArcMap mapview to your desired coordinate system (I recommend the one that matches the data you're trying to overlay, or one from another well-established dataset).
Add one other dataset with a known good coordinate system.
Create your new dataset in this ArcMap session. Give your new data the same coordinate system as the ArcMap mapview and the one other dataset in the map. Set the XY domain of the new data to exceed the area defined by your other dataset, but don't go beyond the size that will reduce your desired spatial resolution.
Create your data. It can be any data at this point. Some lines, some polygons, etc. Save your work.
Export your new dataset. When prompted, choose to save with the coordinate system of the underlying mapview.
Create a new ArcMap session and add your new dataset. Then add your parcel dataset. They should now occupy the same space in your map window.
Edit your new data to your heart's content.
Some probable issues if this doesn't help:
You didn't follow these steps correctly - check the ESRI documentation; this is a well documented issue.
The parcel data you're trying to match doesn't have properly defined coordinate system. It's always possible that the keepers of this data don't know what they're doing and have munged it up. I've seen this problem more times that I care to admit.
You've matched the projection but have mis-matched the datum. Many municipalities are still using data in NAD27, which is way out of date. Some have moved to the modern NAD83. The difference can be up to 300 meters, depending on where in the country you are. Also, data that originates from surveying or GPS equipment is usually collected in WGS84 (the typical default for satellite surveying), which is for all practical purposes the same as NAD83, at least at mapping scale resolutions.
Try researching these issues and see how it goes. I'll say it again:
Manually setting the projection does NOT actually project that data!!
Good luck!
Your problem is probably one of projection
| projection: character string that names a map projection to use. See
| 'mapproject' (in the 'mapproj' library). The default is to
| use a rectangular projection with the aspect ratio chosen so
| that longitude and latitude scales are equivalent at the
| center of the picture.
`-----
Agree that your problem is projection. Is there a .prj file extension associated with either of your files? If not key first is finding out what projects you have. I would guess State Plane of some sort if you are dealing with U.S. centric local data from a local government.
Cadastral tools (surveyer tools) usually let you specify a handful of control points and will then "warp" the data to fit to your control points. This can be anything from a simple shift to something more complex. If everything is shifted by a few feet, you can also just use your "editor" to select all shapefiles and then move them however many feet necessary.
If you've verified that both shapefiles are using the same coordinate system, then projection is less likely to be the problem. It's fairly common for parcel data to be "offset" from other data sources (such as roads). This comes from inconsistent collection methods and points of reference.
Another source of error can be that one of the shapefiles has the wrong coordinate system specified. For example, if the roads were actually WGS 1984, but it's prj is set to NAD1983, you will see some significant errors. This usually happens if you had to manually set the coodinate system for a shapefile (i.e. it didn't include a PRJ and you created one).