Latest Contributions by MichalDudek

Dear all, I would like to learn how to export attributes from one point layer to another without using the proximity tools. I have two shapefiles (point layers) placed within polygons. Point layer no 1 and no 2 have different attributes and they are spread around polygon shapefile. I need to 'export' attributes from point layer no 1 to point layer no 2 in a way that points from layer no 2 placed within the same polygon get the attributes from points in layer no 1. There are cases that there is no point from one layer (1 or 2) within some polygons ore there is none points within a polygon. There are also cases where there are more than one point from point shp no 2 so there is a need to export the same attribute value to these points.  I would be very grateful for any recommendations on what to do step by step. ... View more

Dear all, I have a polygon layer that is a merged layer made from two different layers. Using merge tool I have an attribute table of a new layer that has two different fields (columns) for the same attribute. I would like to combine those two fields into one using the field calculator. The advantage is that for each polygon where there is a blank space in one field there is text describing the name of the polygon in the other. Field1 - Field 2 ....-abcd ....-efgh ijkl-.... I was trying to use the equations: [new value] = [field1] + [field 2] and [new value] = [field1] & [field 2] but there is a space in the front of the value of field 2 in the output field (column). Do you know how to solve it, how to deal with the blank space in the front? I'd be grateful for any infomation. Kind regards ... View more

Dear all, I have a question about the "Join Data" function. I have been trying to join two attribute tables in ArcMap. Both shapefiles contain polygons and the attribute tables have a few fields. The first problem I had was that when I tried to join both tables it did not work. I thought I found the solution (the type of the field in the layer that the join was based on was string and the type of the field in the table to base the join on was double so I changed the string to double adding new field and using the field calculator [old_field]=[new_field] ) and then join. The tables joint but all the fields in the table to base the join on have <null> value which is incorrect because there should be values. I indexed the fields and I used the "join field" data management tool and the result was the same. I am looking for the ideas what can cause the problem and how to solve it. Many thanks, Michał ... View more

Hi, I need help and/or advice with creating a river mileage shapefile using the data I have: - river network (linear shapefile - vector data) - ordinate data (altitude data in point shapefile) spread across the river network (so I know which way the river flows). There are two problems with the data I have: 1. the river network consists of smaller sections creating rivers - it means that one river is divided into smaller sections but in the attribute table of each section there is an attribute with the name of the river so it can be easily identified how many sections each river has 2. the river network is 300 000 sq. km so it makes the analysis very laborious. I decided on the process to do and I need your advice if it is ok and how to do it step-by-step in ArcGIS 10.2. First, I am planning to join each section of the river into one line so every river with different name attribute would be separated. Q: how to do it using the fact that the sections have the same name attribute? Any python script? Secondly, I need to determine spring and mouth for every river based on the ordinate data (point shapefile) - with tool would be the best for it, how to make it? Lastly, I need to create the point shapefile with the mileage points across the river network at 100 interval. The shapefile will be huge. How to do it? Is it possible to make steps 2&3 as one step? I would be grateful for any advice on that. Kind regards, Michal ... View more