Analysis Results of COVID-19 Data by GIS at Different Scales

yanxiang li School of Surveying and Land Information Engineering, Henan Polytechnic University, 454000, China, Jiaozuo zhanliang yuan (  yuan6400@hpu.edu.cn ) School of Surveying and Land Information Engineering, Henan Polytechnic University, 454000, China, Jiaozuo https://orcid.org/0000-0001-8124-3263 qiaoqiao wang Institute of Resources & Environment, Henan Polytechnic University, 454000, China, Jiaozuo

. SARS-CoV-2 is an animal virus belonging to the genus Coronavirus 6 . This is an RNA virus. Because it has a diameter of 60 to 140 nanometers, there are spikes on the surface, and it is crowned under the electron microscope. Virus hosts may be bats, snakes, seafood and pangolins 7,8 . According to the results of the current genome-wide sequencing analysis, SARS-CoV-2 is 96% homologous to the bat coronavirus, so it is judged that the virus uses bat as the original host 4 , but the intermediate host is not yet known 9 .
Since the virus rst appeared in Wuhan, it has spread rapidly in other provinces, cities, and other countries in China 10 , causing great public health concerns worldwide 11 . On January 30, 2020, the World Health Organization declared the 2019 new coronary pneumonia epidemic as "an emergencies public health incident of international concern" 12 . On February 11, 2020, the Director General of the World Health Organization Tan Desai announced in Geneva that the pneumonia infected by the new coronavirus was named "COVID-19" 13 .Since the outbreak of COVID-19, the number of cases has shown a rapid upward trend. Analysis of relevant data shows that there have been cases that have not been to the South China Seafood Market in Wuhan or have been exposed to live poultry, and some cases have not traveled to China. These phenomena indicate that these cases People-to-people phenomena have occurred locally in the country or region where they are located 14 . When a patient coughs or sneezes, a large amount of infected large droplets are generated 14 , which can be spread to others. The human-to-human phenomenon means that COVID-19 patients and asymptomatic patients become the main source of infection 2,15 . The clinical features of COVID-19 are diverse, ranging from asymptomatic to acute respiratory distress syndrome and multiple organ dysfunction or even death [15][16][17] . As of June 5, 2020, a total of 188 countries or regions have reported more than 6.7 million con rmed cases to the World Health Organization, of which more than 390,000 patients died 18 . After the infection and outbreak of  in the world, researchers in different elds have conducted a lot of research on COVID-19 from their respective elds. As early as February, Chinese researchers used spatial analysis methods to show the geographical distribution and changes of the epidemic 11,19 ; the study also investigated the three variable biology of COVID-19 coronavirus infection prevalence and mortality outbreak And epidemiological trends 20 ; selective pressure analysis of the virus was carried out through modeling, and the transmembrane spiral segments of viruses nsp2 and nsp3 were detected 21,22 ; some drugs intended for treatment were found to be arbidol (an antiviral drug from Russia and China) ), intravenous injection of immunoglobulin, interferon, chloroquine and COVID-19 plasma of rehabilitation patients. Various countries are actively studying therapeutic drugs and vaccines, and studies have found that remdesivir, lopinavir and ritonavir may be effective for COVID-19 23  and reduce the ow of people, resulting in a rapid decline in world economic trade. COVID-19 has the potential to destroy personal livelihoods, businesses, industry and the entire economy 26 .In order to jointly deal with the virus crisis, people are also actively responding. In addition to the policies and regulations issued by local governments and appeals to people to minimize outings and reduce crowding, the World Health Organization has also issued a global strategy to deal with the COVID-19 pandemic 27 .

Data And Methods
The data used in this article comes from the Github open source projects CovidData and The New York Times. The CovidData project data is COVID-19 daily data. From January 22, 2020 to the present, it contains three different spatial scales of infection, death and recovery cases in countries, cities and regions 28 . The covid-19-data project in The New York Times provides infections and deaths in various regions of the United States 29 . Geographic information technology can reveal the spatial and temporal pattern and spatial distribution of the epidemic in epidemic prevention and control, and display the status of the epidemic at different scales, which can give people a more intuitive feeling. In this study, the spatial analysis method will be used to analyze the global epidemic data based on ArcGIS 10.7, so that people can have a deeper understanding of the global status of COVID-19.

COVID-19 Global Data Analysis
As of June 5, 2020, there were more than 6.7 million con rmed cases of COVID-19 in 188 countries and regions around the world, and a total of more than 390,000 deaths. The picture of Case Comparison ( Fig.1) shows that the Americas and Europe are the regions with the largest number of infections 30 .
According to statistics, there are 3748633 cases of COVID-19 ending in the world, of which 3350389 cases accounted for 89%, and 398244 deaths accounted for 11%; 3100946 cases of existing infections, including 3047330 cases of mild patients accounted for 98%, severe patients 53616 cases accounted for 2% 31 .
The analysis of the cumulative con rmed cases from January 22, 2020 to June 05, 2020 found that the global spread of COVID-19 is divided into three stages: the virus spreads at a relatively rapid rate during the initial outbreak (January to February), and grows faster (Fig.2 A); in the end of March, the cumulative number of global COVID-19 cases increased exponentially, and COVID-19 entered the global outbreak period (Fig.2 B); since early April, the cumulative number of global cases has risen linearly for a long time Maintaining this trend, as of June 05, 2020, the number of newly diagnosed COVID-19s per day has exceeded 100,000 (Fig.2 C).
The rapid spread of COVID-19 around the world has caused more and more people to die from the virus. Since the outbreak, at least 390,000 people worldwide have died from the virus. Global statistics on deaths have found that the global cumulative death toll curve of COVID-19 (Fig.3) is similar to the global number of diagnosed patients (Fig.2), The COVID-19 global cumulative number of deaths curve has a strong similarity with the global trend of diagnosed people over time (e.g. Fig.2 A, B. Fig.3 D, E, F), indicating that there is a positive correlation between the number of diagnoses and the number of deaths. Since the global prevalence of COVID-19, the lowest point of the global average mortality rate is 2.04% and the highest point is 7.17%. The overall change trend of the global average mortality rate is divided into three stages: the initial stage of the outbreak (2020/01/22-2020/02/05) produces the lowest point from high to low; after the global outbreak (2020/02/06-2020/05/15) The gradual increase in mortality yields the highest point; after the global pandemic (as of now (2020/05/16-2020/06/05), the mortality rate has gradually declined. The important turning point information of the global mortality change is shown in the gure (Fig.3 R1, R2, R3).
Through the analysis of global COVID-19 data, we can see that the spread of the epidemic is divided into three stages: the initial outbreak period, the outbreak period, and the global pandemic period. The latest data shows that COVID-19 is still on the rise in the world, and the number of infected people is increasing, but the mortality rate has been effectively controlled.

COVID-19 Visual analysis of national data
Visual analysis of COVID-19 data from different countries can further re ne the global epidemic distribution. In this study, ArcGIS 10.7 was used to visualize the latest national infection data, and the spatial distribution of the global epidemic situation was visually indicated by a hierarchical color display Fig.4 . In Fig. 4, different countries are classi ed according to the number of COVID-19 cases, which are divided into 10 levels. It can be seen from the gure that the spread of COVID-19 has caused infection in most countries in the world, and the infection in the Americas is the most serious.
Through data screening, there are 14 countries with more than 100,000 COVID-19 infections in the world. After sorting, we get  Fig. 6. Among them, the case growth rate in the United States is the fastest, and it has maintained rapid growth for a long time. Therefore, the current situation of the US COVID-19 epidemic is very worrying. In addition, the number of infected people in Brazil and Russia also showed a strong growth trend.
The severe epidemic situation in the world has forced us to understand the situation in various countries. This paper visually analyzes the mortality rates of different countries around the world, and obtains the Fig.7 global mortality distribution map, and screens out the top 10 countries for global mortality (such as Fig.8). It can be seen from Fig.7 and Fig.8 that the countries with the highest mortality rates in the world are mainly distributed in the western coastal countries of North America and Europe. The countries with the highest mortality rate are Belgium with a high of 16.24%, followed by France and Italy with a mortality rate of 15.31% and 14.4%.

Analysis of the current situation in the US
Through global data analysis and national data visualization analysis, it is found that the global case time series curve (Fig.2) and the US case number time series curve (Fig.6) have strict similarity and the time change nodes of the two curves are very consistent. Therefore, we can determine that changes in the US epidemic affect the direction of the global epidemic. As of June 05, 2020, the number of diagnoses in the United States has reached 1,897,380, accounting for 28.17% of the total number of global infections. Therefore, a data report that analyzes the current situation of the US epidemic in detail is particularly important, which makes people have a more intuitive understanding of the current status of the US COVID-19.

Spatial distribution
The directional distribution (standard deviation ellipse) can be used to summarize the spatial characteristics of geographic features: central trend, dispersion, and directional trend 32 . In this study, the number of infected people in major areas of the United States was selected as the analysis object, and a color map of COVID-19 infection cases was established, and the standard deviation ellipse was established using 1 STANDARD DEVIATION to obtain Fig.9. As can be seen from the color band values in the legend, the number of infected people in each state of the United States is up to 381,019. The direction distribution (standard deviation ellipse) shows that the US epidemic center is biased toward the eastern United States.
In order to further determine the focus areas of the US epidemic, this study conducted a hot spot analysis (Getis-Ord Gi*) based on Fig.9 and obtained Fig.10. It can be seen from the gure that the hot spot area of the US epidemic is near New York State, with 99% con dence that the area is the US epidemic center.
Therefore, several areas adjacent to New York should strengthen epidemic management and control, and control hot spots from spreading further.

The United States data analysis
Further analysis of the epidemic data in the United States, through time series visualization (Fig.11) of infection cases, deaths and mortality found: 1. The number of infections and deaths showed the same change trend and had a strong correlation; 2. The mortality curve uctuated greatly The highest mortality rate is 7.19, which is 0.02 higher than the maximum average mortality rate in the world, which is about two months ahead of the maximum global average mortality rate; 3. At this stage, the COVID-19 mortality rate in the United States is maintaining a downward trend (Fig.11 R), and the downward trend is obvious.

Conclusions
The global pandemic of COVID-19 has had a signi cant impact on all countries in the world. Since the outbreak of COVID-19, it has spread to 188 countries and regions, including 14 countries with more than 100,000 cases, and 1.89 million in the United States. In the top ten countries with the lowest mortality rate, the lowest mortality rate is 8.5%, and the highest is 16 In this study, based on GIS spatial analysis, spatial statistics and time series visualization methods, multiscale visual analysis of global epidemic data was carried out, revealing the multi-scale spatial and temporal pattern and temporal and spatial changes of COVID-19. Multi-scale analysis of COVID-19 can provide support for global epidemic prevention and control and regional epidemic management, so that people have an intuitive understanding of the status of the epidemic. The COVID-19 pandemic poses a huge threat to the lives and health of people around the world. It is the responsibility of all humanity to effectively prevent and control the spread of viruses. It is hoped that the work done in this study will help the global epidemic management. https://www.worldometers.info/coronavirus/%0Ahttps://www.worldometers.info/coronavirus/? (2020).   Countries With COVID-19 Infection Greater Than 100000 (b)Note: The gure only analyzes countries with more than 100,000 people COVID-19 mortality distribution. Note: The designations employed and the presentation of the material on this map do not imply the expression of any opinion whatsoever on the part of Research Square concerning the legal status of any country, territory, city or area or of its authorities, or concerning the delimitation of its frontiers or boundaries. This map has been provided by the authors. COVID-19 Distribution in the United States. Note: The red ellipse in the gure is the direction ellipse, Note: The designations employed and the presentation of the material on this map do not imply the expression of any opinion whatsoever on the part of Research Square concerning the legal status of any country, territory, city or area or of its authorities, or concerning the delimitation of its frontiers or boundaries. This map has been provided by the authors.   Time series visualization of infection cases, number of deaths and mortality in the United States.R is the latest mortality rate; G is the latest number of cases; H is the latest number of deaths.