HS code filtering for restricted items

1. We open the installed arcgis software. Each version of arcgis has measurement functions. The measurement tool can measure the length and area of the graphics, which is convenient for graphers to process and operate the data. So don't worry about the version. 2 We double-click the shortcut to open the arcgis software.

2. Projection transformation: Maps in GIS usually use some kind of geographical projection system to map the earth's surface to the plane. When you draw a square on a plane, the area may not be a square on the surface of the earth, but a deformed shape.

3. The computer system coding is different, there is noCaused by the installation or incorrect installation of GIS software, hardware information is too old or damaged and other reasons.

4. Resource Configuration (Resource Configuration) Various public facilities in cities, the distribution of materials in disaster relief and reduction, nationwide energy security, food supply and other institutions in various places are all resource allocation issues. The goal of GIS in this kind of application is to ensure the most rational allocation of resources and maximize the benefits.

5. GIS equipment is connected to the bottom frame with copper at the ground switch. Other grounding positions depend on the situation of your company's equipment. Some users will also make specific requirements. You can ask your engineer.

Geographic Information System Knowledge Point

1. The relationship between geographic information technology and digital earth 3 "S": remote sensing (RS) to obtain information, global positioning system (GP S) Spatial positioning of information; Geographic Information System (GIS) processes information and analyzes and expresses results. Digital Earth: Digital Earth, that is, a technical system that digitizes the entire earth information and is managed by a computer network.

2. Geographic Information Technology and Digital Earth Digital Earth refers to the digital earth, that is, a technical system managed by a computer network after the entire earth information is digitized.

3. Geographical skills Map reading Map reading refers to understanding the geographical situation on the earth through maps. When reading the map, you need to understand the scale, legend, direction, distance and other basic information of the map. At the same time, you also need to master how to judge the terrain, cultural landscape, traffic and other information through the map.

Senior... I know your question. May I ask if you have the past exam papers of the GIS postgraduate entrance examination of Hu Normal University?.

Remote sensing is an important source of information and data update means of GIS. Remote sensing data has the function of quickly, real-time and dynamic acquisition of spatial information. As a subsystem of GIS, the remote sensing system can provide timely, comprehensive and large-scale resources and environmental data for GIS.

The official website of the school. According to the official website of Hu Normal University, the past exam papers of the postgraduate entrance examination can be found on the school's official website. Hunan Normal University, referred to as "Hunan Normal University", is located in Changsha City, Hunan Province. It is a national "211 Project" key university and a national "double first-class" construction university.

Second, mathematics. Generally, it is the second exam, and there are also some first exams. It will also be useful to learn programming well in mathematics. In a word, graduate students majoring in GIS all have to take the math exam. So prepare well.As for the number of exams, it depends on the school you are applying for. Third, employment prospects. The employment prospects of GIS majors are still very good.

1. What are the main problems in the current spatial database

Does the questioner want to ask "what are the main problems in the current spatial database"? Data bottleneck problem.

Low deployment efficiency: Before deploying Hive/HBase/Kylin, the Hadoop cluster must be deployed. Compared with the traditional database, the deployment efficiency is very inefficient.

Judging from the development of domestic databases, bottlenecks mainly focus on two aspects, one is research and development, and the other is ecology. In terms of research and development, database researchThe starting point of development technology is high and difficult. A mature database product must have profound technical accumulation and precipitation to gradually enter the market.

The main factors affecting database performance are summarized as follows: sql query speed, network card traffic, server hardware, disk IO. The above factors do not affect database performance all the time, but like the barrel effect. If one of the factors seriously affects the performance, the performance of the whole database will be seriously hindered.

Geographic information system, how to learn by yourself?

Some scholars assert that "GIS and information geography are the main tools and means of the second revolution in geographical science.

Learn the basics of computerAt that time, in addition to getting familiar with the basic operations of word and excel, learn advanced applications, such as using excel to make some beautiful reports, do some data processing, filtering, statistical charts, etc., using VBA to do some small applications, and using Access to do some commonly used database management. Manage programs, such as student information management system and so on.

First of all, there should be data. The required data include a topographic map of the area (vector file format) and land use status map (vector format). Traffic map. With these three pictures, you can do it.

Continuous learning: Surveying and mapping engineering is a constantly developing field, and new technologies and methods are constantly emerging. Therefore, you need to maintain a continuous learning attitude and keep up with the development of the industry. In summaryIt takes time and effort to learn surveying and mapping by yourself, but as long as you have determination and perseverance, you will definitely master the knowledge of this discipline.