gis for beginners

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Recently, I have been studying secondary GIS development. As a newbie, the best way is to bubble the Forum and read the source code. Of course, it involves geographical expertise. It cannot be understood in a day or two, only when learning programming, You can gradually experience the knowledge of some geographic specialties. In just a few days, I learned a little bit about it. Let's look at the features first. General functions include ①: Eaglee

var dom = "This allows us to achieve the following effects:When the mouse moves to a province in China, the pop-up box displays the name of the province.For a complete example, see http://www.supermap.com.cn:8090/iserver/iClient/forJavaScript/examples/utfGridLayer.html6. Example: Utfgrid flag EditionAnother attribute featured in the product sample program is an example: Utfgrid flag Edition. This example shows a quick response to a user's mouse movement event through the Utfgrid layer, showing

coordinate transformation is to realize the transformation of the coordinate system of digitized data and the correction of drawing distortion error. It is divided into affine transformation, similarity transformation and two times transformation.1) affine transformation (affinetransform)That is, the coordinate transformation:Set: X, y for the digitizer coordinates, X, y for the theoretical coordinates, M1, M2 for the map landscape and longitudinal actual scale, the two coordinate system angle i

Three years ago, I bought a GIS plug-in framework book from Jiang potao, as recommended by my senior brother. At that time, while reading a book, I made a complete implementation of the examples, which benefited a lot. Later, a plug-in C/S system was developed for the project, using the MEF framework provided by Microsoft. In this system, communication between plug-ins and plug-ins not involved in Jiang potao's book has been completed. However, Jiang

Open-source (free) 3D (terrain, game) GIS platform under. NET platform Axiom: open-source 3D game engine. It is the. Net version of the famous open-source engine ogre. The source code is fully constructed using C #, mainly for the graphic part.Realmforge: open-source 3D game engine. The graphic part adopts axiom and is combined and rewritten by some other modules such as network and AI. It is fully constructed by C. AxiomThe axiom 3D engine is an open

Sharpmap Analysis Note for open-source GIS project based on. NET 2.0 (12): sharpmap WMS service and openlayers access Su Weimin http://www.gisdev.cn/http://blog.csdn.net/suen/ date: 2007-7-12 All copyrights reserved. If you need to reprint the information, contact the author and indicate the source in a conspicuous position. WMS stands for "Web Map Service ). It is an OGC standard that defines three major operations for creating and displayi

Method for generating a flat buffer in GIS In arcengine, there are two buffer generation methods: itopologicaloperator. buffer (double distance) and geopressor. buffer. The first method cannot select a parameter. By default, the circle Header Buffer is generated. The second method requires a buffer for the layer, which is extremely inconvenient for operations on a single element, and the line_end_type parameter is set to "flat ", it cannot be genera

Beijing has now merged Chongwen and Dongcheng into Dongcheng, and Xicheng and Xuanwu into Xicheng. How does GIS merge them? The procedure is as follows: To back up the operated graph, first open "arccatalog ";Figure 1. Open arccatalog Select a work area;Figure 2. Select a work area Select the layers to operate and copy them.Figure 3. file backup Paste and rename the fileFigure 4. file backup and renameIn this way, the file backup operation is com

Spatial data is composed of graphs and attributes, how they are organized together, how spatial indexes and attribute indexes are implemented, and how to sort records, what policies are used to read images? How are images rendered? How are space queries and space analysis achieved? How are graphics Editing performed? With such a question, first let everyone have an understanding of the Framework process. With such a framework, we can further study each link in the framework one by one, here we w

very good by using the geographical location index of MongoDB. After the query results are displayed on the map, they are basically a circle, for example, the display effect, it indicates that the computation is accurate. The query performance is acceptable. In a correction database with around 10 million points, the speed of querying points within 20 kilometers is about 1-2 seconds in a single machine, it takes about 6 to 10 seconds to query a 200 km point. It takes about 20 minutes to query a

Recently, the unity3d and Gis integration project is about coordinate conversion, for example, converting the longitude and latitude (166.23.9.27, 39.55.15.74) to the corresponding position point in unity, not much nonsense about the Code: Using UnityEngine; using System. collections; public class SaiGetLatLog: MonoBehaviour {public Transform firstPoint; // public Transform secondPoint at the upper left of Unity; // public SaiEarth firstSai at the low

GIS There are some common terms in the system. The following describes some basic concepts that are frequently used in the system. Data Dictionary:It is a configuration database that maintains the normal operation of the system and ensures that the system conforms to the actual application. The content includes the ownership name andCodeSystem parameter codes such as the location class name and code, land ownership code, and slope code, as wel

1. Enter the plug-in GIS application framework 1.1 Application Framework 1.1.1 application framework Overview "Framework (FrameworkIs a reusable design of all or part of a system. It is usually composed of a group of abstract classes and classes"1. The development of software products is a complex system engineering. As the complexity of the problems to be solved increases, the software product R D process has evolved from the past "Worksh

> pt1.y (TPT. x> = linept1.x TPT. x (TPT. x> = linept2.x TPT. x Meetpointnum ++;}}Else{Double KK, BB;Double meetpty, meetptx;Kk = (pt1.y-pt2.y)/(pt1.x-pt2.x );BB = pt1.y-kk * pt1.x;Meetpty = KK * TPT. x + BB;Meetptx = TPT. X;// Handle special cases where the intersection is the endpointDouble dx, Dy, dx2, dy2;DX = meetptx-pt1.x;DY = meetpty-pt1.y;Dx2 = meetptx-pt2.x;Dy2 = meetpty-pt2.y;If (dx> =-0.0000000001 DX Dy {Tabpoint pt3;If (k = 1){Pt3 = (tabpoint) part. pointarray-> getat (pointsize

Because we do have a project on tourism, so it involves the map function. One of the tasks I received was to show a few designated sights on the map and add markers to the map.Our project is using Sogou map. The JS version number is used. If you are interested, you can refer to the Search Map API and Demo sample code.Adding markers to a map is a basic function of the map. This mark is called marker. Can be crossing from here on the Internet for marker class introduction.The basic steps to implem

JSON data is common and useful in Android, and JSON data is also supported in ArcGIS, and JSON and geometry can be converted to the data we want.One, geometry converted to JSON dataThis implementation is very simple, for example, when we convert a point to JSON, we also use the powerful class Geometryengine.Point point = new Point(113, 23); String json = GeometryEngine.geometryToJson(SpatialReference.create(SpatialReference.WKID_WGS84), point); Log.w("TAG", "json===" + json);The result of

The main window under Python can be defined as follows:def start (self):#self. Project = Project ("temp")#self. Project.directory = OS.GETCWD ()#Splash = SplashScreen (self.master)Self.hellos = 0Self.master.title ("Stars:space-time Analysis of Regional Systems")Self.master.iconname ("STARS")Self.master.bind ("h = self.winfo_screenheight ()W = self.winfo_screenwidth ()Geom = "%dx%d"% (w,h)Self.master.geometry ("600x400+0+0")The menu is defined as follows: (List only the menu under file, then slig

. Smart tips are mainly used by a JS:This key is you in the Baidu Developer Center registered after get, will not Baidu on the line. The map is then modified. Add Baidu Map Smart tips on the page JS:at the end of the page (To search for input, add an ID of "suggestid", i.e.:This is achieved in a functional way. But to be more aesthetically pleasing, let's set the font style for the drop-down:Baidu smart hint drop-down box font. tangram-suggestion table tr{ font-size:20px;}Finally finished, the

Since I have time today, I will write a few more blog posts, but also for tomorrow to go out to play a good relaxing. As the comrades in the field of GIs know, the traditional Douglas-poke algorithms are recursive implementations. However, sometimes the recursive hierarchy is too deep, there will be stack overflow situation. In this paper, a non recursive algorithm is introduced. To change the recursive algorithm to a non recursive algorithm, it is ge