Questions related to Spatial Data Infrastructure
We are trying to implement semantic Geospatial data infrastructure and want to use OWL files with Geonetwork.
Any hint on how to link ontology files with Geonetwork will be greatly appreciated.
Thank you very much for your time.
I would like to suggest you take the survey "NSDI FOR YOU AND YOUR COUNTRY":
The results of this survey will help me to research the issues of the implementation of NSDI and get an overview of this policy.
I will be very grateful for your help, cooperation and sharing!
As you probably know the concepts of Spatial Data Infrastructure (SDI), National SDI (NSDI), Urban SDI, Gloabl SDI (GSDI). The question I have is that how we handle the relationship between NSDI and Urban SDI. You know there is resolution/detail/purpose difference between NSDI and Urban SDI. However, there has to be coherency between NSDI and urban SDI to continue the services of central government and local government. Please describe and give me some resources about how to bridge NSDI and urban SDI to provide interoperability.
Spatial Data Infrastructure (SDI) or Geographical Data Infrastructure (GII) is known for sometimes for providing the need for spatial science research as well as many other purposes in science and practice. I am looking forward to the further explanation on the question around - how does the contemporary topic of "Research Data Infrastructure" on spatial science will make a difference in regard to "SDI or GII"?
After the geometric correction, i am obtaining negative values in remote sensing reflectance (Rrs). Can someone explain the reason for it? Is there any scientific significance for negative values in Rrs?
It is very common that people describe the resolution in their orientation maps using the pixel/step size value used during mapping. This is fine when the pixel/step size value is larger than the lateral spatial resolution for that measurement but what could happen if one decreases the step/pixel size value well below the spatial resolution for instance when analyzing ultrafine grained materials? Would this be correct or would such a measurement make sense?
When we want to do classifying in the choropleth map, the first question is to determine the number of classes. And the rule 2^n<=x<=2^(n+1) is usually to determine the number of classes. I.e. if there is 70 cities in a region ( i.e. a state), if we want to detect the pattern of population distribution in these cities, we could divide these cities into 6 classes using the above rule. Details: 2^6=64, 2^(6+1)=128, and 64<70<128, so the best number of classes is 6. That is n=6, x=70 (the count of cities).
I forget who first put forward this rule. Can anyone help me to provide the reference about this rule?
Thank you very much!
As I am digitizing polygons in 10.2 ArcGIS, sometimes the vertices are getting deleted automatically and also it does not close as it should by clicking on the last vertex.
2. The final product has an altered shape that it takes on its own.
3. Even while editing vertices as I add a new vertex it deletes the previous one.
4. Also, I tried converting from lines to polygon. That also does not match exactly.
I am frustrated. Any help would be appreciated.
In developing countries, it is difficult to find mentor/supervisor for PhD students who want to pursue their research(s) in new areas such as VGI, SDI, Spatial Data Mining, Spatial Agriculture, m-governance and crowd sourcing etc. The reasons include brain drain. Therefore, to reduce digital divide in a sense, researchers/scholars/institution who can contribute to advise students especially of developing countries voluntarily are requested to help out.
3D Cadastre Discussion 1:
Hi everyone, I am starting a discussion on various topics on 3D cadastre. Each week I will post a new discussion topic, but you are welcome to comment on previous topics as well. The aim of these discussions is to share ideas on individual or jurisdictional experiences in 3D cadastre. For each discussion topic, once there are a fair number of responses, I will summarise them to close off the topic.
The first topic to kick off: why do we need a 3D cadastral database? Are we better off with the current arrangements of 3D plans stored in a 2D database or is there a distinct advantage in investing in a database that is able to store 3D objects? Please share your thoughts.
I am looking for papers and/or descriptions on how one can establish a national level satellite archive with support for pixel level extraction (querying) as well as full imagery. We are looking at depositing national level (+400.000 km2) satellite imagery from Sentinel 2 and Landsat 8 as well as relevant in-situ data for further analysis. This is on an idea level now, but to consider if it could be done it is necessary to look at experiences on how this theoretically could be done.
We are currently investigating the effect of open topographic data in The Netherlands and like to compare our findings with results from other countries
Data Size : approx 50 tb, users: approx 50 users with desktops connected to each other, currently no server hardware.
I modeled urban growth in a city for 4 different scenarios. How to optimize the results of the modeled land use in (say) 2025 and choose a best one? Basically, I want to evaluate the scenarios quantitatively. I have the city master plan demand for 2025. Is it good just to compare the results with the master plan map or we can adopt any other method?
Is "planning as a science" a real problem? How can we build a scientific approach to planning?
Town planning and regional planning are normally considered as techniques of public administrations, or as a part of the architecture (urban design). The Italian concept of Urbanistica at the same time means both analysis and planning, both at local and territorial level, and not only urban land use. Don't worry, I Know that in Italy (but not only here) theory and practices are very different. I think we must develop the scientific aspect of planning (as in urbanistica concept), using carrying capacity, urban metabolism, ecological footprint and so on. That is to say we need the planning as an autonomous science, capable of studying the anthropic transformations and of directing technical applications. Many people do not agree with this statement, notwithstanding, just one example, the UE European Green Capital Award. In ECGA we really find applied these concepts. Land use and rights to property seem to be untouchable (all do remember Garret Hardin, but few Elinor Olstrom). Every nation has a specific view of planning in laws and in practices. Every one has his definition for planning (urban-, social-, physical-, rational-, comprehensive- planning, aménagement du territoire, urbanisme, stadtplanung, raumplanung, urbanistica and so on). So it is nearly impossible to compare plans, choices and technical regulations on zoning and land use, and also assess the environmental impacts. Is it also a problem of Spatial Data Infrastructures?
I want to know how I can fill the data gaps in Landsat SLC off data using Erdas 9.3 software. I tried the ArcGIS extension tool, but it removes the data gap portion and thus distorting the geometry of the Image.