The importance of keyhole satellite imagery in geographical research and social development from the 60s to the 80s of the 20th century. Here are some possible extensions and additions to this description:
1.Technical limitations and preciousness: The limitations of early satellite images are mainly manifested in the small photographic format, low resolution, and limited quality. These technical limitations not only challenged the interpretation and use of imagery, but also lacked accurate positioning information before the Global Positioning Satellite System (GPS) was established at the time. Despite this, these data were considered valuable because they faithfully recorded the geography of the time and provided valuable data for missing geographic information.
2.Geocorrection of Imagery: describes the geocorrection of imagery in the absence of GPS. This highlights the need for researchers to rely on existing map data for correction when using this data, while also mentioning the complexity and workload of the process.
3.Application fields of data: The application of this batch of data in the study of historical changes, natural landforms, artificial landforms, agricultural production, forestry distribution, living environment and other aspects is mentioned. The specific uses of data in these areas could be further elaborated, for example, by analysing the distribution of land for urban buildings and agriculture to extrapolate economic and social trends.
4.Data Comparative Analysis and Research Value: It is emphasized that many socio-economic data with research value can be obtained by inverting the data and comparing the current situation with the current situation. This process provides insight into the evolution of physical geography and social development, and thus inferences about future trends. The significance of this process is not only to provide historical data, but also to inform future decision-making and planning.
5.Socio-economic significance of geographic information: Finally, the importance of these data for the analysis of the laws of nature and the laws of social development can be emphasized. By revealing geographic information over historical periods, it helps to understand the interrelationships of society, economy, and the environment, providing deep insights into sustainable development and planning. These data are not only historical records, but also tools to provide support and guidance for socio-economic development.